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An elongated lowland between ranges of mountains, hills, or other uplands, often having a river or stream running along the bottom.
(noun)
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An extensive area of land drained or irrigated by a river system.
(noun)
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A depression or hollow resembling or suggesting a valley, as the point at which the two slopes of a roof meet.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.