Definition of "river basin" [river basin]

• The land area drained by a river and its tributaries. (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.

• "But when the glaciers in the Tibetan Plateau, in the Himalayas melt away, and they are doing it at about four meters per year, and the big rivers that feed off these glaciers become seasonal only with rain, and that affects their crops and their farmers along the river basin, I think they'll have to sit back and ask themselves, do you want this huge upset in your demography?"
• "The most fastidious would hardly fail to appreciate an object lesson given this morning of the river basin."
• "If nothing is done in the river basin, the following is expected:"