body of water, water - the part of the earth's surface covered with water (such as a river or lake or ocean); "they invaded our territorial waters"; "they were sitting by the water's edge"

ditch - any small natural waterway

mare clausum - (closed sea) a navigable body of water under the jurisdiction of a single nation

mare liberum - (free sea) a navigable body of water to which all nations have equal access

rapid - a part of a river where the current is very fast

canal - long and narrow strip of water made for boats or for irrigation

flume - watercourse that consists of an open artificial chute filled with water for power or for carrying logs

headrace - a waterway that feeds water to a mill or water wheel or turbine

tailrace - a watercourse that carries water away from a mill or water wheel or turbine

way - any artifact consisting of a road or path affording passage from one place to another; "he said he was looking for the way out"