bodies of land. Spring – a point where groundwater flows out of the ground, and is thus where the aquifer surface meets the ground surface Strait – a narrow channel of water that connects two larger bodies of water, and thus lies between two land masses. Stream – a body of water with a detectable current, confined within a bed and banks. Stream pool – a stretch of a river or stream in which the water is relatively deep and slow moving. Streamlet — a small stream; rivulet. Subglacial lake – a lake that is permanently covered by ice and whose water remains liquid by the pressure of the ice sheet and geothermal heating. They often occur under glaciers or ice caps. Lake Vostok in Antarctica is an example. Swamp – a wetland that features permanent inundation of large areas of land by shallow bodies of water, generally with a substantial number of hummocks, or dry-land protrusions. Swimming pool – an artificial container filled with water intended for swimming. Tank – (or stock tank, Texas) an artificial pond, usually for watering cattle or other livestock. Tarn – a mountain lake or pool formed in a cirque excavated by a glacier. Tide pool – a rocky pool adjacent to an ocean and filled with seawater. Tributary or affluent – a stream or river that flows into the main stem (or parent) river or a lake. Vernal pool – a shallow, natural depression in level ground, with no permanent above-ground outlet, that holds water seasonally. Wadi – a usually-dry creek bed or gulch that temporarily fills with water after a heavy rain, or seasonally; located in North Africa and Western Asia. See also arroyo (creek). Wash – a usually dry creek bed or gulch that temporarily fills with water after a heavy rain, or seasonally. See also wadi. Wetland – an environment "at the interface between truly terrestrial ecosystems and truly aquatic systems making them different from each yet highly dependent on both". See also Glossary of landforms References Sources Mitsch, W.J. and J.G. Gosselink. 2007. Wetlands, 4th ed., John Wiley & Sons, Inc., New York, 582 pp. Citations External links Types of Water Bodies (archived 12 November 2011)