a drainage basin is the geographical area draining into a river or reservoir. If it over flows, I think that is bad because it could cause a flood.
It's drainage area is 1061469 km.
Look on the map of drainage divides. USGS
Look on the map of drainage divides. USGS
River Indus's drainage basin has an area of 1165000 square kilometers.
Area having a common drainage is catchment area, whereas area which is uses that water from common drainage area is command area.
inland drainage basin area is an area where rivers disappear without reaching the sea
Drainage Basin: The Area of Land Drained By A River.
Drainage Basin
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The drainage basin of the Nile covers 1,256,591 square miles or about 10% of the area of Africa.
The boundary of the drainage basin is called a drainage divide. Sometimes drainage basin is called catchment area referring to an area where water flows into a stream or a number of streams. In North America drainage basin is also called Watershed.