Hectare in the context of Frioul archipelago

The Axios Delta National Park (Greek: Εθνικό Πάρκο Δέλτα Αξιού), officially the Axios-Loudias-Aliakmonas Delta National Park (Εθνικό Πάρκο Δέλτα Αξιού-Λουδία-Αλιάκμονα), is a national park on the west coast of the Thermaic Gulf in Greece, consisting of multiple wetlands. It covers an area of 33,800 ha and is a Ramsar site, an Important Bird Area and part of the Natura 2000 network.

An old-growth forest or primary forest is a forest that has developed over a long period of time without disturbance. Due to this, old-growth forests exhibit unique ecological features. The Food and Agriculture Organization of the United Nations defines primary forests as naturally regenerated forests of native tree species where there are no clearly visible indications of human activity and the ecological processes are not significantly disturbed. One-third (34 percent) of the world's forests are primary forests. Old-growth features include diverse tree-related structures that provide diverse wildlife habitats that increases the biodiversity of the forested ecosystem. Virgin or first-growth forests are old-growth forests that have never been logged. The concept of diverse tree structure includes multi-layered canopies and canopy gaps, greatly varying tree heights and diameters, and diverse tree species and classes and sizes of woody debris.

As of 2020, the world has 1.11 billion ha (2.7 billion acres) of primary forest remaining. Combined, three countries (Brazil, Canada, and Russia) host more than half (61 percent) of the world's primary forest. The area of primary forest has decreased by 81 million ha (200 million acres) since 1990, but the rate of loss more than halved in 2010–2020 compared with the previous decade.

In archaeology, survey or field survey is a type of field research by which archaeologists (often landscape archaeologists) search for archaeological sites and collect information about the location, distribution and organization of past human cultures across a large area (e.g. typically in excess of one hectare, and often in excess of many km). Archaeologists conduct surveys to search for particular archaeological sites or kinds of sites, to detect patterns in the distribution of material culture over regions, to make generalizations or test hypotheses about past cultures, and to assess the risks that development projects will have adverse impacts on archaeological heritage.

Archaeological surveys may be: (a) intrusive or non-intrusive, depending on the needs of the survey team (and the risk of destroying archaeological evidence if intrusive methods are used) and; (b) extensive or intensive, depending on the types of research questions being asked of the landscape in question. Surveys can be a practical way to decide whether or not to carry out an excavation (as a way of recording the basic details of a possible site), but may also be ends in themselves, as they produce important information about past human activities in a regional context.

Fair Park is a recreational and educational complex in Dallas, Texas, United States, located immediately east of downtown. The 277-acre (112 ha) area is registered as a Dallas Landmark and National Historic Landmark; many of the buildings were constructed for the Texas Centennial Exposition in 1936.

Fair Park has been designated a Great Place in America by the American Planning Association.

Australia has many forests of importance due to significant features, despite being one of the driest continents. As of 2009, Australia has approximately 147 million hectares of native forest, which represents about 19% of Australia's land area. The majority of Australia's trees are hardwoods, typically eucalypts, rather than softwoods like pine. While softwoods dominate some native forests, their total area is judged insufficient to constitute a major forest type in Australia's National Forest Inventory. The Forests Australia website provides up-to-date information on Australia's forests. Detailed information on Australia's forests is available from Australia's State of the Forests Reports that are published every five years.

Tetzcoco (Classical Nahuatl: Tetzco(h)co pronounced [tetsˈkoʔko], Otomi: Antamäwädehe) was a major Acolhua altepetl (city-state) in the central Mexican plateau region of Mesoamerica during the Late Postclassic period of pre-Columbian Mesoamerican chronology. It was situated on the eastern bank of Lake Texcoco in the Valley of Mexico, to the northeast of the Aztec capital, Tenochtitlan. The site of pre-Columbian Tetzcoco is now subsumed by the modern Mexican municipio of Texcoco and its major settlement, the city formally known as Texcoco de Mora. It also lies within the greater metropolitan area of Mexico City.

Pre-Columbian Tetzcoco is most noted for its membership in the Aztec Triple Alliance. At the time of the Spanish conquest of the Aztec Empire, it was one of the largest and most prestigious cities in central Mexico, second only to the Aztec capital, Tenochtitlan. A survey of Mesoamerican cities estimated that pre-conquest Tetzcoco had a population of 24,000+ and occupied an area of 450 hectares.

A savanna or savannah is a mixed woodland-grassland (i.e. grassy woodland) biome and ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground to support an unbroken herbaceous layer consisting primarily of grasses. Four savanna forms exist; savanna woodland, where trees and shrubs form a light canopy; tree savanna, with scattered trees and shrubs; shrub savanna, with distributed shrubs; and grass savanna, where trees and shrubs are mostly nonexistent.

Savannas maintain an open canopy despite a high tree density. It is often believed that savannas feature widely spaced, scattered trees. However, in many savannas, tree densities are higher and trees are more regularly spaced than in forests. The South American savanna types cerrado sensu stricto and cerrado dense typically have densities of trees similar to or higher than that found in South American tropical forests, with savanna ranging from 800 to 3300 trees per hectare (trees/ha) and adjacent forests with 800–2000 trees/ha. Similarly Guinean savanna has 129 trees/ha, compared to 103 for riparian forest, while Eastern Australian sclerophyll forests have average tree densities of approximately 100 per hectare, comparable to savannas in the same region.

The Orinoco (Spanish pronunciation: [oɾiˈnoko]) is one of the longest rivers in South America at 2,140 km (1,330 mi). Its drainage basin, sometimes known as the Orinoquia, covers approximately 1,000,000 km (390,000 sq mi), with 65% of it in Venezuela and 35% in Colombia. It is the fourth largest river in the world by discharge volume of water (39,000 m/s (1,400,000 cu ft/s) at delta) due to the high precipitation throughout its catchment area (2,300 millimetres per are [0.084 in/sq ft]). The Orinoco River and its tributaries are the major transportation system for eastern and interior Venezuela and the Llanos of Colombia. The environment and wildlife in the Orinoco's basin are extremely diverse.

Rayfoun (Arabic: ريفون; also spelled Reifun or Raifoun) is a village and municipality located in the Keserwan District of the Keserwan-Jbeil Governorate of Lebanon. The village is about 28 kilometres (17 mi) north of Beirut. It has an average elevation of 1,050 meters above sea level and a total land area of 189 hectares. Rayfoun's inhabitants are predominantly Maronites. Rayfoun is the hometown of Maronite Patriarch Nasrallah Boutros Sfeir and the Ottoman-era peasant leader Tanyus Shahin.

Pločnik (archaeological site) is located in Pločnik, Prokuplje village in the Toplica District of Serbia. A 120 hectare settlement belonging to the Neolithic Vinča culture existed on the site from 5500 BCE until it was destroyed by fire in 4700 BCE.

Reforestation is the practice of restoring previously existing forests and woodlands that have been destroyed or damaged. The prior forest destruction might have happened through deforestation, clearcutting or wildfires. Three important purposes of reforestation programs are for harvesting of wood, for climate change mitigation, and for ecosystem and habitat restoration purposes. One method of reforestation is to establish tree plantations, also called plantation forests. They cover about 131 million ha worldwide, which is 3% of the global forest area and 45% of the total area of planted forests.

Globally, planted forests increased from 4.1% to 7.0% of the total forest area between 1990 and 2015. Plantation forests made up 280 million ha (hectare) in 2015, an increase of about 40 million ha in the previous ten years. Of the planted forests worldwide, 18% of that area consists of exotic or introduced species while the rest consist of species native to the country where they are planted.

Most lakes in Finland are small, but there are 309 lakes or reservoirs with a surface area larger than 10 km². There are about 5,600 lakes in Finland that are larger than 0.1 km² (10 hectares or 100'000 square metres), and 187,888 lakes larger than five ares (500 square metres / 5,382 sq.ft.). There is no standard unambiguous definition of the size requirements for a water body to be classified as a lake.  Saimaa is the largest lake in Finland, and the fourth-largest natural freshwater lake in Europe.

They are listed here along with some smaller noteworthy lakes.

Medium-density housing is a term used within urban planning and academic literature to refer to a category of residential development that falls between detached suburban housing and large multi-story buildings. There is no singular definition of medium-density housing as its precise definition tends to vary between jurisdiction. Scholars however, have found that medium density housing ranges from about 25 to 80 dwellings per hectare, although most commonly sits around 30 and 40 dwellings/hectare. Typical examples of medium-density housing include duplexes, triplexes, townhouses, row homes, detached homes with garden suites, and walk-up apartment buildings.

In Australia the density of standard suburban residential areas has traditionally been between 8-15 dwellings per hectare. In New Zealand medium-density development is defined as four or more units with an average density of less than 350m. Such developments typically consist of semi-attached and multi-unit housing (also known as grouped housing) and low-rise apartments.

The acre (/ˈeɪkər/ AY-kər) is a unit of land area used in the British imperial and the United States customary systems. It is traditionally defined as the area of one chain by one furlong (66 by 660 feet), which is exactly equal to 10 square chains, 1⁄640 of a square mile, 4,840 square yards, or 43,560 square feet, and approximately 4,047 m, or about 40% of a hectare. The acre is sometimes abbreviated ac, but is usually spelled out as the word "acre".

Traditionally, in the Middle Ages, an acre was conceived of as the area of land that could be ploughed by one man using a team of eight oxen in one day. The acre is still a statutory measure in the United States, where both the international acre and the US survey acre are in use, but they differ by only four parts per million. The most common use of the acre is to measure tracts of land. The acre is used in many existing and former Commonwealth of Nations countries by custom. In a few, it continues as a statute measure, although not since 2010 in the UK, and not for decades in Australia, New Zealand, and South Africa. In many places where the acre is no longer a statute measure, it is still lawful to use as supplementary information next to the statutory hectare measurement.

Ususău (Hungarian: Marosaszó) is a commune in Arad County, Romania, situated in the couloir zone of the river Mureș, in the northern part of the Lipova Hills. The administrative territory of the commune is 13,543 hectares. It is composed of five villages: Bruznic (Marosborosznok), Dorgoș (Dorgos), Pătârș (Petercse), Ususău (situated at 43 km from Arad) and Zăbalț (Szabálcs). Until 2005, the commune was called Dorgoș and that village was the commune centre.