Above mean sea level


Height above mean sea level isn't a fixed, universal measurement; instead, it's a vertical distance calculated relative to a vertical datum based on historical mean sea level, and this 'zero level' can differ between countries due to variations in reference points and the periods over which measurements were taken.

⭐ In the context of height above mean sea level, why might the 'zero level' differ between various countries?


⭐ Core Definition: Above mean sea level

Height above mean sea level is a measure of a location's vertical distance (height, elevation or altitude) in reference to a vertical datum based on a historic mean sea level. In geodesy, it is formalized as orthometric height. The zero level varies in different countries due to different reference points and historic measurement periods. Climate change and other forces can cause sea levels and elevations to vary over time.

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In the context of height above mean sea level, why might the 'zero level' differ between various countries?
HINT: The establishment of a 'zero level' for height above mean sea level relies on a vertical datum and historical data, both of which are subject to national standards and the specific timeframe of measurements, leading to discrepancies between countries.

In this Dossier

Above mean sea level in the context of Patmos

Patmos (Greek: Î ÎŹÏ„ÎŒÎżÏ‚, pronounced [ˈpatmos]) is a Greek island in the Aegean Sea. It is famous as the place where, according to Christian belief, John of Patmos received the vision found in the Book of Revelation of the New Testament, and where the book was written.

One of the northernmost islands of the Dodecanese complex, Patmos has a population of 3,283 (2021) and an area of 34.05 km (13.15 sq mi). The highest point is Profitis Ilias, 269 metres (883 ft) above sea level. The municipality of Patmos, which includes the offshore islands of Arkoi (pop. 44), Marathos (pop. 5), and several uninhabited islets, has a population of 3,047 (2011 census) and a combined land area of 45.039 square kilometres (17.390 sq mi). It is part of the Kalymnos regional unit.

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Above mean sea level in the context of Andorra

Andorra, officially the Principality of Andorra, is a landlocked country on the Iberian Peninsula, in the eastern Pyrenees in Southwestern Europe, bordered by France to the north and Spain to the south. Believed to have been created by Charlemagne, Andorra was ruled by the count of Urgell until 988, when it was transferred to the Diocese of Urgell. The present principality was formed by a charter in 1278. It is currently headed by two co-princes: the Bishop of Urgell in Catalonia, Spain, and the president of France. Its capital and largest city is Andorra la Vella.

Andorra is the sixth-smallest state in Europe, with an area of 468 square kilometres (181 sq mi) and a population of approximately 87,486. The Andorran people are a Romance ethnic group closely related to Catalans. Andorra is the world's 16th-smallest country by land and 11th-smallest by population. Its capital, Andorra la Vella, is the highest capital city in Europe, at an elevation of 1,023 metres (3,356 feet) above sea level. The official language is Catalan, but Spanish, Portuguese, and French are also commonly spoken.

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Above mean sea level in the context of Maja Jezercë

Jezercë (Albanian definite form: Jezerca) is the highest peak in the Dinaric Alps, the second highest in Albania and the sixth highest in Southeast Europe, standing at 2,694 m (8,839 ft) above sea level. It is the 28th most prominent mountain peak in Europe, and is regarded as one of the toughest and most dangerous climbs in the Albanian Alps.

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Above mean sea level in the context of Agathonisi

AgathonĂ­si (Greek: Î‘ÎłÎ±ÎžÎżÎœÎźÏƒÎč) is a small Greek island and municipality located at the northernmost point of the Dodecanese in Greece. It is surrounded by many smaller islands and is home to two villages, both inland; Megalo Chorio ("Big Village"), and Mikro Chorio ("Small Village"). Between them is the small settlement of Agios Georgios (Saint George), which forms the island's only harbor and consists of a few hotels and restaurants. The island is also locally known as Gaidaro ("Donkey"), or by its ancient name Tragea.

The highest point on the island is 209 metres (686 feet) above sea level. This peak is located close to Mikro Chorio. The island covers an area of 13.5 square kilometres (5.2 square miles). It is made almost entirely of subcrystalline stratified limestones, and is covered with thorny macchia.

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Above mean sea level in the context of Monte Titano

Monte Titano ("Mount Titan") is a mountain of the Apennines and the highest point in the country of San Marino. It stands 739 m (2,425 ft) above sea level Its peak is located within the municipal limits of the country's capital, San Marino, immediately east of the urbanized area.

It was inscribed as a UNESCO World Heritage Site in 2008 under the combined title "San Marino Historic Centre and Mount Titano". Inscribed under reference no. 1245 criteria iii, the two together encompass an area of 55 ha with a buffer zone of 167 ha. It encompasses Mount Titano and the other structures such as the fortification towers, walls, gates and bastions, as well as a neo-classical basilica located on it and its slopes forming a small but unique urban conglomerate.

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Above mean sea level in the context of Swiss Plateau

The Swiss Plateau or Central Plateau is one of the three major landscapes in Switzerland, lying between the Jura Mountains and the Swiss Alps. It covers about 30% of the Swiss surface area, and is partly flat but mostly hilly. The average height is between 400 metres (1,300 ft) and 700 metres (2,300 ft) AMSL. It is by far the most densely populated region of Switzerland, the center of economy and important transportation.

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Above mean sea level in the context of Pelion

Pelion or Pelium (Modern Greek: ΠΟλÎčÎż, PĂ­lio; Ancient Greek/Katharevousa: ΠΟλÎčÎżÎœ, Pēlion) is a mountain at the southeastern part of Thessaly in northern Greece, forming a hook-like peninsula between the Pagasetic Gulf and the Aegean Sea. Its highest summit, Pourianos Stavros, is 1,624 metres (5,328 ft) amsl. The Greek National Road 38 (GR-38) runs through the southern portion of the peninsula and GR-38A runs through the middle.

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Above mean sea level in the context of Mount Othrys

Mount Othrys (Greek: ÏŒÏÎżÏ‚ ΌΞρυς – oros Othrys, also ΌΞρη – Othri) is a mountain range of central Greece, in the northeastern part of Phthiotis and southern part of Magnesia. Its highest summit, Gerakovouni, situated on the border of Phthiotis and Magnesia, is 1,726 m (5,663 ft) above sea level. The population density in the mountains is low: there are a few small villages, including Anavra in the northwest, Kokkotoi in the northeast, Palaiokerasia in the south and Neraida in the southwest. The length from west to east is about 35 km (22 mi) and the width from north to south is about 25 km (16 mi). The Pagasetic Gulf lies to the northeast, and the Malian Gulf lies to the south. The summit Gerakovouni lies 19 km (12 mi) south of Almyros, 27 km (17 mi) northeast of Lamia and 44 km (27 mi) southwest of Volos. The peaks of the range are above the tree line. The main mineral constituent of the rock is ophiolite.

A Natura 2000 protected area has been defined over much, but not all, of the range according to the Birds Directive. Of interest to the government is the protection of the raptors and the prevention of clear-cutting and other settlement measures that would destroy their traditional habitat. The area, named Oros Othrys, Vouna Gkouras kai Farangi Palaio Kerasias, ID GR1430006, includes the eastern range, a spur to the south to cover Palaiokerasia Gorge, and a spur to the north to cover Gkouras Hill.

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Above mean sea level in the context of Kumanovo

Kumanovo (Macedonian: ĐšŃƒĐŒĐ°ĐœĐŸĐČĐŸ [kuˈmanɔvɔ] ; Albanian: KumanovĂ«, Albanian definite form: Kumanova; also known by other alternative names) is the second-largest city in North Macedonia after the capital Skopje and the seat of Kumanovo Municipality, the largest municipality in the country. Kumanovo lies 340 metres (1,115 feet) above sea level and is surrounded by the Karadag part of Skopska Crna Gora mountain on its western side, GradiĆĄtanska mountain on its southern side, and Mangovica and German mountain on the eastern side. The Skopje Airport also serves Kumanovo.

It has many historical sites. One of its most important is the 4,000-year-old megalithic astronomical observatory of Kokino, located 30 km (19 mi) northeast of Kumanovo and discovered in 2001. It is ranked fourth on the list of old observatories by NASA.

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Above mean sea level in the context of La Paz

La Paz (Spanish: [la ˈpas]; lit. 'the peace'), officially Nuestra Señora de La Paz (Aymara: Chuqi Yapu Aymara pronunciation: [ˈtʃoqɛ ˈjapʊ]), is the seat of government of Bolivia. With 755,732 residents as of 2024, it is the third-most populous city in Bolivia. Its metropolitan area, which includes the neighboring city of El Alto, and other smaller towns, is the second most populous urban area in Bolivia, with a population of 2.2 million, after Santa Cruz de la Sierra with a population of 2.3 million. The city is also the capital of the department of the same name.

Located in west-central Bolivia 68 km (42 mi) southeast of Lake Titicaca, La Paz is set in a canyon created by the Choqueyapu River. It is in a bowl-like depression, part of the Amazon basin, surrounded by the high mountains of the Altiplano. Overlooking the city is the triple-peaked Illimani. Its peaks are always snow-covered and can be seen from many parts of the city. At an elevation of roughly 3,650 m (11,975 ft) above sea level, La Paz is the highest administrative capital city in the world. Due to its altitude, the city has an unusual subtropical highland climate, with rainy summers and dry winters.

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Above mean sea level in the context of Santiago

Santiago (/ˌsĂŠntiˈɑːɡoʊ/ SAN-tee-AH-goh, US also /ˌsɑːn-/ SAHN-, Spanish: [sanˈtjaÉŁo]), also known as Santiago de Chile (Spanish: [sanˈtjaÉŁo ðe ˈtʃile] ), is the capital and largest city of Chile and one of the largest cities in the Americas. Most of the city is situated between 500–650 m (1,640–2,133 ft) above sea level. Located in the Chilean Central Valley within the Santiago Basin, between the Andes to the east and the Chilean Coastal Range to the west, it anchors the Santiago Metropolitan Region and its conurbation of Greater Santiago, which comprises more than forty communes and concentrates over a third of the national population and around 45% of Chile’s GDP. Most of the city lies between 500 and 650 m (1,640–2,133 ft) above sea level, with recent urban growth extending into the Andean foothills.

The basin that Santiago occupies has been inhabited since at least the 10th millennium BC, with early agricultural villages established along the Mapocho River and later incorporated into the Inca sphere of influence. During the Spanish invasion of the Americas, conquistador Pedro de Valdivia founded the colonial city of Santiago del Nuevo Extremo on 12 February 1541, laying out a grid plan around the Plaza Mayor (now Plaza de Armas). Despite early food shortages, Indigenous attacks, floods, and devastating earthquakes—notably in 1647—the city consolidated as the capital of the Captaincy General of Chile. Santiago remained the political center during the Chilean War of Independence, beginning with the First Government Junta in 1810 and culminating in patriot victory at the Battle of MaipĂș in 1818, and subsequently expanded through 19th-century railway construction, state-building projects, and the creation of major educational and cultural institutions.

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Above mean sea level in the context of Valley of Mexico

The Valley of Mexico (Spanish: Valle de MĂ©xico; Nahuatl languages: Anahuac, lit. 'Land Between the Waters'), sometimes also called Basin of Mexico, is a highlands plateau in central Mexico. Surrounded by mountains and volcanoes, the Valley of Mexico was a centre for several pre-Columbian civilizations including Teotihuacan, the Toltec, and the Aztec Empire. The valley used to contain five interconnected lakes called Lake Zumpango, Lake Xaltocan (Nahuatl languages: Xāltocān), Lake Xochimilco, Lake Chalco and the largest, Lake Texcoco, covering about 1,500 square kilometers (580 sq mi) of the valley floor. When the Spaniards arrived in the Valley of Mexico, it had one of the highest population concentrations in the world with about one million people. After the conquest of the Aztec Empire, the Spaniards rebuilt the largest and most dominant city, Mēxihco Tenƍchtitlan, renaming it Ciudad de MĂ©xico (Mexico City) and over time began to drain the lakes' waters to control flooding.

The Valley of Mexico is located in the Trans-Mexican Volcanic Belt. The valley contains most of the Mexico City metropolitan area, as well as parts of the State of Mexico, Hidalgo, Tlaxcala, and Puebla. The Basin of Mexico covers approximately 9,600 km (3,700 sq mi) in the NNE-SSW direction with length to width dimensions of approximately 125 km (78 miles) to 75 km (47 miles) The Valley of Mexico can be subdivided into four basins, but the largest and most-studied is the area that contains Mexico City. This section of the valley in particular is colloquially referred to as the "Valley of Mexico".The valley has a minimum elevation of 2,200 meters (7,200 ft) above sea level and is surrounded by mountains and volcanoes that reach elevations of over 5,000 meters (16,000 ft). It is an enclosed valley with no natural outlet for water to flow to the sea although there is a gap to the north where there is a high mesa but no high mountain peaks. Within this vulnerable watershed all the native fishes were extinct by the end of the 20th century. Hydrologically, the valley has three features. The first feature is the lakebeds of five now-extinct lakes, which are located in the southernmost and largest of the four sub-basins. The other two features are piedmont, and the mountainsides that collect the precipitation that eventually flows to the lake area. These last two are found in all four of the sub-basins of the valley. Today, the Valley drains through a series of artificial canals to the Tula River, and eventually the Påruco River and the Gulf of Mexico. Seismic activity is frequent here, and the valley is an earthquake-prone zone.

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Above mean sea level in the context of Monte AlbĂĄn

Monte Albån is a large pre-Columbian archaeological site in the Santa Cruz Xoxocotlån Municipality in the southern Mexican state of Oaxaca (17.043° N, 96.767°W). The site is located on a low mountainous range rising above the plain in the central section of the Valley of Oaxaca, where the latter's northern Etla, eastern Tlacolula, and southern Zimatlån and Ocotlån (or Valle Grande) branches meet. The present-day state capital Oaxaca City is located approximately 9 km (6 mi) east of Monte Albån.

The partially excavated civic ceremonial center of the Monte Albån site is situated atop an artificially leveled ridge. It has an elevation of about 1,940 m (6,400 ft) above mean sea level and rises some 400 m (1,300 ft) from the valley floor, in an easily defensible location. In addition to the monumental core, the site is characterized by several hundred artificial terraces, and a dozen clusters of mounded architecture covering the entire ridgeline and surrounding flanks. The archaeological ruins on the nearby Atzompa and El Gallo hills to the north are traditionally considered to be an integral part of the ancient city as well.

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Above mean sea level in the context of Granada

Granada (/ÉĄrəˈnɑːdə/ grə-NAH-də; Spanish: [ÉĄÉŸaˈnaða] ) is the capital city of the province of Granada, in the autonomous community of Andalusia, Spain. Granada is located at the foot of the Sierra Nevada mountains, at the confluence of four rivers, the Darro, the Genil, the Monachil and the Beiro. Ascribed to the Vega de Granada comarca, the city sits at an average elevation of 738 m (2,421 ft) above sea level, yet is only one hour by car from the Mediterranean coast, the Costa Tropical. With a population of 233,532 as of 2024, it is the 20th-largest city in Spain.

Nearby is the Sierra Nevada Ski Station, where the FIS Alpine World Ski Championships 1996 were held. Its nearest airport is Federico García Lorca Granada-Jaén Airport.

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Above mean sea level in the context of Ioannina

Ioannina (Greek: Î™Ï‰ÎŹÎœÎœÎčΜα IoĂĄnnina [i.oˈa.ni.na] ), often called Yannena (ΓÎčÎŹÎœÎœÎ”ÎœÎ± YĂĄnnena [ˈʝa.ne.na]) within Greece, is the capital and largest city of the Ioannina regional unit and of Epirus, an administrative region in northwestern Greece.

According to the 2021 census, the city population was 64,896 while the municipality had 113,978 inhabitants. It lies at an elevation of approximately 500 metres (1,640 feet) above sea level, on the western shore of Lake Pamvotis (ΠαΌÎČώτÎčς). Ioannina is located 410 km (255 mi) northwest of Athens, 260 kilometres (162 miles) southwest of Thessaloniki and 80 km (50 miles) east of the port of Igoumenitsa on the Ionian Sea.

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Above mean sea level in the context of Korçë

Korçë (pronounced [ˈkɔɟtʃə]; Albanian definite form: Korça) is the eighth most populous city of Albania and the seat of Korçë County and Korçë Municipality. The total population of the city is 51,152 and 75,994 of Korçë municipality (2011 census), in a total area of 806 km (311 sq mi). It stands on a plateau some 850 m (2,789 ft) above sea level, surrounded by the Morava Mountains.

The area of the Old Bazaar, including Mirahori Mosque, is considered as the urban core of the city. Founded by the local Ottoman Albanian nobleman Ilias Bey Mirahori, the urban area of Korçë dates back to the late 15th century and the beginning of the 16th century, however its actual physiognomy was realized in the 19th century, during a period that corresponds with the rapid growth and development of the city. The Old Bazaar has played a dominant role in Albania's market history. Korçë is the largest city of eastern Albania and an important cultural and industrial centre.

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Above mean sea level in the context of Zagreb

Zagreb (/ˈzɑːɡrɛb/ ZAH-greb Croatian: [zǎːɡreb] ) is the capital and largest city of Croatia. It is in the north of the country, along the Sava river, at the southern slopes of the Medvednica mountain. Zagreb stands near the international border between Croatia and Slovenia at an elevation of approximately 158 m (518 ft) above sea level. At the 2021 census, the city itself had a population of 767,131, while the population of Zagreb metropolitan area is 1,086,528.

The oldest settlement in the vicinity of the city was the Roman Andautonia, in today's Ơćitarjevo. The historical record of the name "Zagreb" dates from 1134, in reference to the foundation of the settlement at Kaptol in 1094. Zagreb became a free royal city in 1242. In 1851, Janko Kamauf became Zagreb's first mayor. Zagreb has special status as a Croatian administrative division—it comprises a consolidated city-county (but separate from Zagreb County), and is administratively subdivided into 17 city districts. Most of the city districts lie at a low elevation along the valley of the river Sava, whereas northern and northeastern city districts, such as Podsljeme and Sesvete districts are spread out across the foothills of the Medvednica mountain, making the city's geographical image rather diverse. The city spans about 30 km from east to west, while stretching about 20 km from north to south. Zagreb ranks as a global city, with a 'Beta-' rating from the Globalization and World Cities Research Network.

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