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A small stream, often a tributary to a river. Creeks are sometimes tidal or influenced by tides.

An area of land that is either covered by water or saturated with water. Wetlands are ecosystems that provide habitat for a variety of plant and animal species.

A slowly moving mass or river of ice formed by the accumulation and compaction of snow on mountains or near the poles.

A small, narrow river. Streams often combine to form a larger river.

The tidal mouth of a large river, where the tide meets the stream. Estuaries are dynamic environments with a mix of saltwater and freshwater.

A small body of still water formed naturally or by artificial means, typically smaller than a lake.

A shallow body of water separated from a larger sea by barrier islands or reefs. Lagoons are often characterized by calm waters and are a mixture of freshwater and sea water.

An inlet of the sea or other body of water usually smaller than a gulf, surrounded by land on three sides.

An area filled with water, localized in a basin, surrounded by land, apart from any river or other outlet that serves to feed or drain the lake.

A long, deep, narrow body of water that reaches far inland, formed by the submergence of a glaciated valley.

A large natural stream of water flowing in a channel to the sea, a lake, or another river. Rivers are part of the hydrological cycle.

A large natural or artificial lake used as a source of water supply. Reservoirs are often created by dams.

A vast body of saline water that covers approximately 71% of Earth's surface. Oceans are major areas and contain significant biodiversity.

A large body of saltwater surrounded in whole or in part by land. Seas are smaller than oceans and are typically connected to an ocean.