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

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

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

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.

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.

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

A deep inlet of the sea almost surrounded by land, with a narrow mouth.

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

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

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