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| A large group or chain of islands. |
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| A mountain or hill, usually having a cuplike crater at the summit, formed around such a vent from the ash and lava expelled through it. |
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| A body of water forming an indentation of the shoreline, larger than a cove but smaller than a gulf. |
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| An artificial waterway for navigation, irrigation, etc. |
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| An elongated lowland between ranges of mountains, hills, or other uplands, often having a river or stream running along the bottom. |
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| A hollow or natural passage under or into the earth, especially one with an opening to the surface. |
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| The bed of a stream, river, or other waterway. |
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| A high steep face of a rock. |
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| A treeless area between the icecap and the tree line of Arctic regions, having a permanently frozen subsoil and supporting low-growing vegetation such as lichens, mosses, and stunted shrubs. |
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| A divide separating river systems that flow to opposite sides of a continent. |
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| The cup-shaped depression or cavity on the surface of the earth or other heavenly body marking the orifice of a volcano. Often caused by collision or explosion. |
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| A nearly flat plain of alluvial deposit between diverging branches of the mouth of a river, often, though not necessarily, triangular. |
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| A long, narrow arm of the sea bordered by steep cliffs: usually formed by glacial erosion. |
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| A hot spring that intermittently sends up fountainlike jets of water and steam into the air. |
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| A swamp is a type of freshwater wetland that has spongy, muddly land and a lot of water. |
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| A deep narrow passage with steep rocky sides; a ravine. |
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| A portion of an ocean or sea partly enclosed by land. |
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| A natural elevation of the earth's surface, smaller than a mountain. |
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| A ridge of rocks or sand, often of coral debris, at or near the surface of the water. |
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| A tract of land completely surrounded by water, and not large enough to be called a continent. |
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| A narrow strip of land, bordered on both sides by water, connecting two larger bodies of land. |
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| A wild land overgrown with dense vegetation, often nearly impenetrable, esp. tropical vegetation or a tropical rain forest. |
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| An area of shallow water separated from the sea by low sandy dunes. |
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| A body of salt water of considerable size, surrounded by land. |
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| A land formation, less extensive than a plateau, having steep walls and a relatively flat top |
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| A strait is a narrow body of water that connects two larger bodies of water. |
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| The continuous body of salt water covering most of the earth's surface. |
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| An area of land not significantly higher than adjacent areas and with relatively minor differences in elevation, commonly less than 500 ft. (150 m), within the area. |
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| A natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels. |
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