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For example, the Antarctic ice sheet can be divided into basins, [1] and most of Libya is included in the Mediterranean Sea basin even though almost no water from the interior actually reaches the sea.
A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, the drainage divide, [1] made up of a succession of elevated features, such as ridges and hills.
A false-colour satellite photo of Australia's Lake Eyre Image credit: NASA's Earth Observatory Lake Eyre Basin (Queensland, New South Wales, Northern Territory, South Australia), which drains into the highly variable Lake Eyre and includes Lake Frome.
The endorheic basin that feeds water into Üüreg Lake, Mongolia NASA photo of the endorheic Tarim Basin, China. An endorheic basin (/ ˌ ɛ n d oʊ ˈ r iː. ɪ k / EN-doh-REE-ik; also endoreic basin and endorreic basin) is a drainage basin that normally retains water and allows no outflow to other external bodies of water (e.g. rivers and oceans); instead, the water drainage flows into ...
1. Pacific Northwest Basin; 2. California River Basin; 3. Great Basin; 4. Lower Colorado River Basin; 5. Upper Colorado River Basin; 6. Rio Grande River Basin
The Pacific Ocean is also an active, shrinking oceanic basin, even though it has both spreading ridge and oceanic trenches. Perhaps the best example of an inactive oceanic basin is the Gulf of Mexico, which formed in Jurassic times and has been doing nothing but collecting sediments since then. [15]
Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin.It is an important step in many areas of environmental science, engineering, and management, for example to study flooding, aquatic habitat, or water pollution.
A classic example is the Canadian Shield. During the last ice age , the topsoil was scraped off, leaving mostly bare rock. The melting of the glaciers left land with many irregularities of elevation and a great deal of water to collect in the low points, resulting in the region's many lakes.