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A river drainage basin is an area drained by a river and all of its tributaries. A river basin is made up of many different watersheds. A watershed is a small version of a river basin. Every stream and tributary has its own watershed, which drains to a larger stream or wetland.

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A bay is a body of water partially surrounded by land. A bay is usually smaller and less enclosed than a gulf. The mouth of the bay, where meets the ocean or lake, is typically wider than that of a gulf. In naming bays and gulfs, people have not always made these distinctions.

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A bay is a body of water partially surrounded by land. A bay is usually smaller and less enclosed than a gulf. The mouth of the bay, where meets the ocean or lake, is typically wider than that of a gulf. In naming bays and gulfs, people have not always made these distinctions.

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In physical geography, a channel is a type of land form consisting of the outline of a path of relatively shallow and narrow body of fluid, most commonly the confine of a river, river delta or strait.

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A tributary is a freshwater stream that feeds into a larger stream or river. The larger, or parent, river is called the mainstem. The point where a tributarymeets the mainstem is called the confluence.Tributaries, also called affluents, do not flow directly into the ocean.

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A tributary is a freshwater stream that feeds into a larger stream or river. The larger, or parent, river is called the mainstem. The point where a tributarymeets the mainstem is called the confluence.Tributaries, also called affluents, do not flow directly into the ocean.

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A strait is a naturally formed, narrow, typically navigable waterway that connects two larger bodies of water.

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The coast is the land along a sea. The boundary of acoast, where land meets water, is called the coastline. Waves, tides, and currents help create coastlines. When waves crash onto shore, they wear away at, or erode, the land.

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The continuous body of salt water that covers most of the Earth's surface. A region of water within an ocean and partly enclosed by land, such as the North Sea. See Note at ocean. A large body of either fresh or salt water that is completely enclosed by land, such as the Caspian Sea.

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A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water.

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In North America, the Continental Divide is a series of mountain ridges stretching from Alaska to Mexico, marking the separation of drainage basins that empty into the Pacific Ocean or Bering Sea from those that empty into the Arctic or Atlantic Oceans or the Gulf of Mexico.

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A river delta is a land-form that forms from deposition of sediment carried by a river as the flow leaves its mouth and enters slower-moving or standing water. This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or (more rarely) another river that cannot transport away the supplied sediment.

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A gulf is a portion of the ocean that penetrates land. Gulfs vary greatly in size, shape, and depth. They are generally larger and more deeply indented than bays. Like bays, they often make excellent harbors.

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Is an isolated area of vegetation in a desert, typically surrounding a spring or similar water source, such as a pond or small lake. Oases also provide habitat for animals and even humans if the area is big enough.

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A harbor is a safe place providing refuge and comfort. If you're traveling, the harbor provided by a warm hotel is welcome. For ships, a harbor is a sheltered port area shielded from waves, where it's safe to dock. Harbor can also be used as a verb, which describes maintaining a belief or a feeling.

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An ocean current is any more or less permanent or continuous, directed movement of ocean water that flows in one of the Earth's oceans. The currents are generated from the forces acting upon the water like the earth's rotation, the wind, the temperature and salinity differences and the gravitation of the moon.

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An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys.

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

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An escarpment is a steep slope or long cliff that forms as an effect of faulting or erosion and separates two relatively level areas of differing elevations. Usually escarpment is used interchangeably with scarp.