mountain range - a group or line of mountains with a particular name, canyon - a large valley with very steep sides and usually a river flowing along the bottom, glacier - a large mass of ice that moves slowly, reef - a line of rocks or sand just above or just below the surface of the sea, often dangerous to ships:, waterfall - water, especially from a river or stream, dropping from a higher to a lower point, sometimes from a great height, bay - a part of the coast where the land curves in so that the sea is surrounded by land on three sides, dune - a hill of sand near a beach or in a desert, volcano - a mountain with a large, circular hole at the top through which lava (= hot liquid rock) gases, steam, and dust are or have been forced out,

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