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reef a series of rocks in a body of water, the tops of which are slightly beneath, or at, the surface reservoir a natural or artificial lake, usually made by damming a stream of running water ridge a long, narrow, conspicuous elevation of land right bank the bank of a stream which lies on the right side as one goes with the current river a large stream of water of natural origin which drains an area of land and flows into another river or body of water river mouth the point where a river empties and ends its course river source the point where a river begins sandbar a long, narrow bank of sand in a body of water savannah a tropical or subtropical grassland containing scattered trees and drought-resistant undergrowth sea a large body of water partly or nearly surrounded by land sea level the average level of the surface of the ocean measured along a shoreline seaport a harbor at the shore of the ocean or large body of water developed with facilities to load and unload sea-going vessels shoal any very shallow spot in a body of water shore land bordering the sea, a lake, or a large river shoreline the line where the land meets the water of any large river or body of water slope any land whose surface gradually rises in a general direction snowline the line on a mountain above which there is snow throughout the year soil loose material which forms the upper surface of the earth sound a long and rather narrow body of water, larger than a strait, connecting two large bodies of water or separating a large island from the mainland spit a long, narrow, sandy point of land projecting into water steppe Russian term form mid-latitude grasslands strait a passageway of water connecting two large bodies of water stream a flow of moving water summit highest part of a hill or mountain swamp an area of low, spongy land too wet to farm but usually supporting an abundance of coarse grasses, trees, or other vegetation tableland a level area of high land varying in size from a mesa to an extensive plateau terrace a level and rather narrow area of land with one steep edge bordering a river, a lake, or the sea tide alternate rise and fall of the water level of a lake or ocean caused by gravitational pull of the moon on the earth timber forest land covered by trees of sufficient size, kind, and quality to be of commercial value timberline the line on a mountain above which trees do not grow topography the surface features of a region (hills, rivers, roads, etc.) tributary a stream that flows into another stream tundra a large, flat plain without trees in the arctic regions tunnel an artificial passage beneath the surface of the earth upstream direction from which a stream is flowing