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a water passage where the tide meets a river current
Estuary
a long, narrow, and usually steep-sided depression in the ocean floor
Trench
a sandbank or sandbar that makes the water shallow
Shoal
a fracture in the crust of a planet (such as the earth) or moon accompanied by a displacement of one side of the fracture with respect to the other usually in a direction parallel to the fracture
Fault
a tract of land surrounded by water and smaller than a continent
Island
land near a shore
Coast
a natural chamber or series of chambers in the earth or in the side of a hill or cliff
Cave
a shallow sound, channel, or pond near or communicating with a larger body of water
Lagoon
an elongate depression of the earth's surface usually between ranges of hills or mountains
Valley
a comparatively narrow passageway connecting two large bodies of water