body of water

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Used other than as an idiom: see body,‎ of,‎ water.
• noun Any significant accumulation of water, usually covering the Earth or another planet, such as a river, lake or a bay.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the part of the earth's surface covered with water (such as a river or lake or ocean)