Peloponnese in the context of Geological depression

Patras (/pəˈtræs, ˈpætrəs/; Greek: Πάτρα, romanized: Pátra pronounced [ˈpatra] ; Katharevousa and Ancient Greek: Πάτραι; Latin: Patrae) is Greece's third-largest city and the regional capital and largest city of Western Greece, in the northern Peloponnese, 215 km (134 mi) west of Athens. The city is built at the foot of Mount Panachaikon, overlooking the Gulf of Patras.

As of the 2021 census, the municipality of Patras has a population of 215,922, while the urban population is 173,600. The core settlement has a history spanning four millennia. In the Roman period, it had become a cosmopolitan centre of the eastern Mediterranean whilst, according to the Christian tradition, it was also the place of Saint Andrew's martyrdom.

Greece is a country in Southeastern Europe, on the Balkan Peninsula. It is bordered to the north by Albania, North Macedonia and Bulgaria; to the east by Turkey, and is surrounded to the east by the Aegean Sea, to the south by the Cretan and the Libyan seas, and to the west by the Ionian Sea which separates Greece from Italy.

The country consists of an extremely rough, mountainous, peninsular mainland jutting out into the Mediterranean Sea at the southernmost tip of the Balkans, and two smaller peninsulas projecting from it:the Chalkidiki and the Peloponnese, which is joined to the mainland by the Isthmus of Corinth. Greece also has many islands, of various sizes, the largest being Crete, Euboea, Lesvos, Rhodes, Chios, Kefalonia, and Corfu; groups of smaller islands include the Dodecanese and the Cyclades. According to the CIA World Factbook, Greece has 13,676 kilometres (8,498 mi) of coastline, the largest in the Mediterranean Basin.

The Ionian Sea is an elongated bay of the Mediterranean Sea. It is connected to the Adriatic Sea to the north, and is bounded by Southern Italy, including Basilicata, Calabria, Sicily, and the Salento peninsula to the west, southern Albania (and western Apulia, Italy) to the north, and the west coast of Greece, including the Peloponnese.

All major islands in the sea, which are located in the east of the sea, belong to Greece. They are collectively named the Ionian Islands, the main ones being Corfu, Kefalonia, Zakynthos, Lefkada, and Ithaca.

The Sea of Crete (Greek: Κρητικό Πέλαγος, Kritiko Pelagos), or Cretan Sea, is a sea, part of the Aegean Sea, located in its southern extremity, with a total surface area of 45,000 km (17,000 sq mi). The sea stretches to the north of the island of Crete, east of the islands of Kythera and Antikythera, south of the Cyclades, and west of the Dodecanese islands of Rhodes, Karpathos and Kassos. The bounding sea to the west is the Ionian Sea. To the northwest is the Myrtoan Sea, a subdivision of the Mediterranean Sea that lies between the Cyclades and Peloponnese. To the east-southeast is the rest of the Mediterranean Sea, sometimes credited as the Levantine Sea. Across the island of Crete, to the opposite shore of it begins the Libyan Sea. Ferry routes to and from Piraeus and Heraklion, as well as the southern islands of the Aegean and the Dodecanese, run in this area.

Just off the coastline of Northeastern Crete, the sea reaches a maximum depth of near 3,293 m (10,000 ft). Other sources (maps) show a maximum depth of 2,591 m (8,500 ft).

Continental Greece (Greek: Στερεά Ελλάδα, romanized: Stereá Elláda; formerly Χέρσος Ἑλλάς, Chérsos Ellás), colloquially known as Roumeli (Ρούμελη), is a traditional geographic region of Greece. In English, the area is usually called Central Greece, but the equivalent Greek term (Κεντρική Ελλάδα, Kentrikí Elláda) is more rarely used.

It includes the southern part of the Greek mainland (sans the Peloponnese), as well as the offshore island of Euboea. Since 1987, its territory has been divided among the administrative regions of Central Greece and Attica, and the regional unit (former prefecture) of Aetolia-Acarnania in the administrative region of Western Greece.

Mycenaean Greece (or the Mycenaean civilization) was the last phase of the Bronze Age in ancient Greece, spanning the period from approximately 1750 to 1050 BC. It represents the first advanced and distinctively Greek civilization in mainland Greece with its palatial states, urban organization, works of art, and writing system. The Mycenaeans were mainland Greek peoples who were likely stimulated by their contact with insular Minoan Crete and other Mediterranean cultures to develop a more sophisticated sociopolitical culture of their own. The most prominent site was Mycenae, after which the culture of this era is named. Other centers of power that emerged included Pylos, Tiryns, and Midea in the Peloponnese, Orchomenos, Thebes, and Athens in Central Greece, and Iolcos in Thessaly. Mycenaean settlements also appeared in Epirus, Macedonia, on islands in the Aegean Sea, on the south-west coast of Asia Minor, and on Cyprus, while Mycenaean-influenced settlements appeared in the Levant and Italy.

The Mycenaean Greeks introduced several innovations in the fields of engineering, architecture and military infrastructure, while trade over vast areas of the Mediterranean was essential for the Mycenaean economy. Their syllabic script, Linear B, offers the first written records of the Greek language, and their religion already included several deities also to be found in the Olympic pantheon. Mycenaean Greece was dominated by a warrior elite society and consisted of a network of palace-centered states that developed rigid hierarchical, political, social, and economic systems. At the head of this society was the king, known as a wanax.

Sparta was a prominent city-state in Laconia in ancient Greece. In antiquity, the state was known as Lacedaemon (Λακεδαίμων, Lakedaímōn), while "Sparta" referred to its capital, a group of villages in the valley of the Evrotas River in Laconia, in southeastern Peloponnese. Around 650 BC, it rose to become one of the major military powers in Greece, a status it retained until 371 BC.

Sparta was recognized as the leading force of the unified Greek military during the Greco-Persian Wars, in rivalry with the rising naval power of Athens. Sparta was the principal enemy of Athens during the Peloponnesian War (431–404 BC), from which it emerged victorious after the Battle of Aegospotami. Thebes' victory over Sparta at the Battle of Leuctra in 371 BC ended Spartan hegemony and freed Messenia from Spartan rule; the loss of the slave labor this region provided sent the city into terminal decline as a military power, though it retained its independence until its forcible integration into the Achaean League in 192 BC. The city recovered some autonomy after the Roman conquest of Greece in 146 BC and became a tourist destination during the Roman era, restoring some measure of prosperity. However, Sparta was sacked in 396 AD by the Visigothic king Alaric, and underwent a long period of decline into the medieval period, when much of its population relocated to Mystras. Modern Sparta is a provincial town and the seat of the Laconia regional administration.

The Peloponnesian League (/pɛləpəˈniːʃən/) was an alliance of ancient Greek city-states, dominated by Sparta and centred on the Peloponnese, which lasted from c. 550 to 366 BC. It is known mainly for being one of the two rivals in the Peloponnesian War (431–404 BC), against the Delian League, which was dominated by Athens.

37°54′19″N 22°52′49″E / 37.9053455°N 22.8801924°E / 37.9053455; 22.8801924

Corinth (/ˈkɒrɪnθ/ KORR-inth; Ancient Greek: Κόρινθος Kórinthos; Doric Greek: Ϙόρινθος Qórinthos; Latin: Corinthus) was a city-state (polis) on the Isthmus of Corinth, the narrow stretch of land that joins the Peloponnese peninsula to the mainland of Greece, roughly halfway between Athens and Sparta. The modern city of Corinth is located approximately 5 kilometres (3.1 mi) northeast of the ancient ruins. Since 1896, systematic archaeological investigations of the Corinth Excavations by the American School of Classical Studies at Athens have revealed large parts of the ancient city, and recent excavations conducted by the Greek Ministry of Culture have brought to light important new facets of antiquity.

Western Greece Region (Greek: Περιφέρεια Δυτικής Ελλάδας, romanized: Periféria Dhitikís Elládhas, [periˈferia ðitiˈcis eˈlaðas]) is one of the thirteen administrative regions of Greece. It comprises the western part of continental Greece and the northwestern part of the Peloponnese peninsula. It occupies an area of 11,336 km (4,377 sq mi) and its population is, according to the 2011 census, at 679,796 inhabitants. The capital of the Western Greece is Patras, the third-largest-city in the country, with a population of about 280,000 inhabitants. The NUTS 2 code for the region of Western Greece is EL63.

The Panachaiko (Greek: Παναχαϊκό, "Panachaean"), also known as Vodias (Βοδιάς) mainly at the Middle Ages, is a mountain range in Achaea, Peloponnese, Greece. It spans about 20 km in length from north to south, and 15–20 km from east to west. It is the northernmost mountain range in the Peloponnese. The highest point, named Pyrgos Palavou (Πύργος Παλαβού), is 1,926 metres (6,319 ft).

The mountain is home to two shelters, Greece's largest wind farm with 40 generators, which opened in 2006, and two communications stations. Snow is common in areas over 1,000 m in the winter. Paragliding is common in areas under 1,100 m. Due to overgrazing, frequent forest fires, and the appropriation of land for housing, the mountain's ecology and soil have suffered greatly, to the extent that much of the soil is now barren or can only support herbaceous vegetation. The range is sparsely forested, mainly on its western and southern slopes, while the most fertile areas lie on the eastern and western slopes.

The Gulf of Patras (Greek: Πατραϊκός Κόλπος, Patraikós Kólpos) is a branch of the Ionian Sea in Western Greece. On the east, it is closed by the Strait of Rion between capes Rio and Antirrio, near the Rio-Antirrio bridge, that is the entrance of the Gulf of Corinth. On the west, it is bounded by a line from Oxeia island to Cape Araxos. To the north it is bounded by the shore of Aetolia-Acarnania in continental Greece, and to the south by Achaea in the Peloponnese peninsula. It is 40–50 km (25–31 mi) long, 10–20 km (6–12 mi) wide, and has an area of 350–400 km.

The port city of Patras lies to the southeast and is the only major port on the gulf. It serves ferries to Ancona and Brindisi in Italy and to Cephalonia. On the northern shore Missolonghi, also has a port. The old ports of Rio and Antirrio lie at the east end of the Gulf; there is a ferry service between them which complements the traffic over the Rio-Antirio bridge. The gulf is rich in fish and molluscs, including sea snails and clams.

The Pindus, also Pindos or Pindhos is a mountain range located in Northern Greece and Southern Albania. It is roughly 160 km (99 mi) long, with a maximum elevation of 2,637 metres (8,652 ft) (Mount Smolikas). Because it runs north to south along much of mainland Greece, the Pindus range is known colloquially as the spine of Greece. The mountain range stretches from near the Greek-Albanian border in southern Albania, entering the Epirus and Macedonia regions in northern Greece down to the north of the Peloponnese. Geologically, it is an extension of the Dinaric Alps, which dominate the western region of the Balkan Peninsula.

A series of military conflicts between the Ottoman Empire and various European states took place from the Late Middle Ages up through the early 20th century. The earliest conflicts began during the Byzantine–Ottoman wars, waged in Anatolia in the late 13th century before entering Europe in the mid-14th century with the Bulgarian–Ottoman wars. The mid-15th century saw the Serbian–Ottoman wars and the Albanian-Ottoman wars. Much of this period was characterized by the Ottoman expansion into the Balkans. The Ottoman Empire made further inroads into Central Europe in the 15th and 16th centuries, culminating in the peak of Ottoman territorial claims in Europe.

The Ottoman–Venetian wars spanned four centuries, starting in 1423 and lasting until 1718. This period witnessed the fall of Negroponte in 1470, the siege of Malta in 1565, the fall of Famagusta (Cyprus) in 1571, the defeat of the Ottoman fleet at the Battle of Lepanto in 1571 (at that time the largest naval battle in history), the fall of Candia (Crete) in 1669, the Venetian reconquest of Morea (Peloponnese) in the 1680s and its loss again in 1715. The island of Venetian-ruled Corfu remained the only Greek island not conquered by the Ottomans.

Crete (/kriːt/ KREET; Greek: Κρήτη, Modern: Kríti [ˈkriti], Ancient: Krḗtē [krɛ̌ːtεː]) is the largest and most populous of the Greek islands, the 90th largest island in the world, and the fifth largest island in the Mediterranean Sea, after Sicily, Sardinia, Cyprus, and Corsica. Crete is located approximately 100 km (62 mi) south of the Peloponnese, and about 300 km (190 mi) southwest of Anatolia. Crete has an area of 8,450 km (3,260 sq mi) and a coastline of 1,046 km (650 mi). It bounds the southern border of the Aegean Sea, with the Sea of Crete (or North Cretan Sea) to the north and the Libyan Sea (or South Cretan Sea) to the south. Crete covers 260 km from west to east but is narrow from north to south, spanning three degrees of longitude but only half a degree of latitude.

Crete and its surrounding islands and islets form the Region of Crete (Greek: Περιφέρεια Κρήτης), which is the southernmost of the 13 top-level administrative units of Greece, and the fifth most populous of Greece's regions. Its capital and largest city is Heraklion, located on the island's north shore. As of 2021, the region had a population of 624,408. The Dodecanese are located to the northeast of Crete, while the Cyclades are situated to the north, separated by the Sea of Crete.

The Saronic Islands or Argo-Saronic Islands is an archipelago in Greece, named after the Saronic Gulf in which they are located, just off the Greek mainland. The main inhabited islands of this group are Salamis, Aegina, Agistri, and Poros. The islands of Hydra and Dokos, which lie off the northeast tip of the Peloponnese (technically between the Saronic Gulf and the Argolic Gulf), are sometimes included as part of the Saronic Islands.

Many mainland Greeks have vacation homes in the Saronic Islands, which are regularly served by ferries from the Athen's port of Piraeus and the Peloponnese. Salamis, the largest island of the group, is where the ancient Greek navy defeated the Persians in the Battle of Salamis in 480 BC.

The Isthmus of Corinth (Greek: Ισθμός της Κορίνθου) is the narrow land bridge which connects the Peloponnese peninsula with the rest of the mainland of Greece, near the city of Corinth. The 6.3 km (3.9 mi) wide Isthmus was known in the ancient world as the landmark separating the Peloponnese from mainland Greece. In the first century AD the geographer Strabo noted a stele on the Isthmus of Corinth, which bore two inscriptions. One towards the East, i.e. towards Megara, reading: "Here is not Peloponnesus, but Ionia" (τάδ᾽ οὐχὶ Πελοπόννησος, ἀλλ᾽ Ἰωνία) and the one towards the West, i.e. towards the Peloponnese: "Here is Peloponnesus, not Ionia" (τάδ᾽ ἐστὶ Πελοπόννησος, οὐκ Ἰωνία); Plutarch ascribed the erection of the stele to the Attic hero Theseus, on his way to Athens.

To the west of the Isthmus is the Gulf of Corinth, and to the east the Saronic Gulf. Since 1893 the Corinth Canal has run through the isthmus, effectively making the Peloponnese an island. Today, two road bridges, two railway bridges and two submersible bridges at both ends of the canal connect the mainland side of the isthmus with the Peloponnese side. Also a military emergency bridge is located at the west end of the canal.