flood plain

noun
a nearly flat plain along the course of a stream or river that is naturally subject to flooding.
Also, flood·plain.


Origin:
1870–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
flood plain
 
n
the flat area bordering a river, composed of sediment deposited during flooding

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Flood plain is always a great word to know.
So is gobo. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Example sentences
Historically, such settlements have clung to the higher ground on the flood
  plain.
If a river floods repeatedly, over time this sediment will build up into a
  flood plain.
Amends various provisions relating to flood plain management.
If the water spreads out over a flood plain, it is much more shallow than it
  would be if still contained in the river.
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