The difference between Drainage basin and River basin
When used as nouns, drainage basin means a topographic region in which all water drains to a common outlet, whereas river basin means an extent of land where water from rain or snow melt drains downhill into a river or series of rivers.
check bellow for the other definitions of Drainage basin and River basin
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Drainage basin as a noun (hydrology):
A topographic region in which all water drains to a common outlet; a watershed.
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River basin as a noun (geography):
An extent of land where water from rain or snow melt drains downhill into a river or series of rivers.