Portal:Lakes

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The Lakes Portal
A portal dedicated to Lakes

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Introduction

Lac Gentau in the Ossau Valley of the Pyrenees, France

A lake is a naturally occurring, relatively large and fixed body of water on the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from the ocean, although they may be connected with the ocean by rivers, such as Lake Ontario. Most lakes are freshwater and account for almost all the world's surface freshwater, but some are salt lakes with salinities even higher than that of seawater. Lakes vary significantly in surface area and volume.

Lakes are typically larger and deeper than ponds, which are also water-filled basins on land, although there are no official definitions or scientific criteria distinguishing the two. Lakes are also distinct from lagoons, which are shallow tidal pools dammed by sandbars at coastal regions of oceans or large lakes. Most lakes are fed by springs, and both fed and drained by creeks and rivers, but some lakes are endorheic without any outflow, while volcanic lakes are filled directly by precipitation runoffs and do not have any inflow streams.

Natural lakes are generally found in mountainous areas (i.e. alpine lakes), dormant volcanic craters, rift zones and areas with ongoing glaciation. Other lakes are found in depressed landforms or along the courses of mature rivers, where a river channel has widened over a basin formed by eroded floodplains and wetlands. Some parts of the world have many lakes formed by the chaotic drainage patterns left over from the last ice age. All lakes are temporary over long periods of time, as they will slowly fill in with sediments or spill out of the basin containing them. (Full article...)

Lake Chillisquaque from the west in July

Lake Chillisquaque (also known as Montour Lake) is a lake and reservoir in Montour County, Pennsylvania, in the United States. It has a surface area of 165 acres. The lake is situated on Middle Branch Chillisquaque Creek, which it is named after. Nearby communities include Danville and Washingtonville. The lake has an elevation of 567 feet (173 m) above sea level and is up to 40 feet (12 m) deep. It has several coves, including Goose Cove, Heron Cove, and Jellyfish Cove. The lake is dammed on its southern side by the Lake Chillisquaque Dam, which is 2,000 feet (610 m) long and 54 feet (16 m) high. The metals with the highest concentrations are calcium and iron. Nonmetals such as nitrogen and phosphorus are also found in the lake. It experiences agricultural runoff as well.

Lake Chillisquaque is owned by Pennsylvania energy company Talen. It was constructed in 1972 and was originally created to serve as a supply of cooling water for the Montour Power Plant (a purpose which it still serves), but has also come to be used for recreational purposes. Approximately 200 bird species have been observed on or near the lake and more than 50 species of waterfowl pass by the lake during migration. It is also inhabited by numerous species of fish, some of which are stocked by the Pennsylvania Fish and Boat Commission. Various trees, shrubs, and herbaceous plants live in the vicinity of the lake as well. The main recreational activities on or near Lake Chillisquaque include fishing, boating, and hiking. The lake is also surrounded by the Montour Preserve, a nature preserve. (Full article...)
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Tulainyo Lake is a freshwater alpine lake in the eastern Sierra Nevada in the U.S. state of California
Tulainyo Lake is a freshwater alpine lake in the eastern Sierra Nevada in the U.S. state of California

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