A waterway is a natural or man-made CHANNEL for the transportation of water. An AQUEDUCT is an artificial waterway, usually made of stone or brick, used to transport water from one place to another. A WATERCOURSE is a natural body of flowing water, such as a river or STREAM. A CONDUIT is a pipe or CHANNEL that carries water from one place to another. A DITCH is a long, narrow trench dug in the ground to carry water away from an area. A CREEK is a small STREAM or tributary of a larger body of water. A STREAM is a body of flowing water, typically smaller than a river. A CHANNEL is a deep, narrow body of water connecting two larger bodies of water. A CANAL is an artificial waterway constructed to connect two bodies of water or to irrigate land. A river is a large natural STREAM of water flowing in a CHANNEL to the sea, a lake, or another river. A BAYOU is a slow-moving STREAM or river found in the southern United States. A RIA is a coastal INLET formed by the partial submergence of an unglaciated river valley. An INLET is a narrow body of water leading into a larger body of water. A SLUICE is a CHANNEL or gate through which water flows, especially one used to regulate the flow of a river.