The "basin" of the Volga is not limited to its actual catchment area.
The catchment area from which the Caspian is fed extends to a very much greater distance on the west and north than it does on the south and east.
Towards the end of the period, however, during the deposition of the Portlandian beds, the sea again retreated, and in the early part of the Cretaceous period was limited (in France) to the catchment basins of the Sane and Rhnein the Paris basin the contemporaneous deposits were chiefly estuarine and were confined to the northern and eastern rim.
The annual rainfall and the area of the catchment afford no measure whatever as to the size of a river in the interior of Australia.
The Ganges is essentially a river of great cities: Calcutta, Monghyr, Patna, Benares and Allahabad all lie on its course below its junction with the Jumna; and the ancient capitals, Agra and Delhi, are on the Jumna, higher up. The catchment basin of the Ganges is bounded on the N.
Suffice, for there is no sufficient catchment area north of the snows to support it.
There is evidence also that glacial moraine formations from time to time may have largely affected the catchment area of these tributary streams. It would be as rash to assert that from Lake Victoria no waters could ever have issued with an eastward flow as it would be to state that 'from Chakmaktin none ever flow westwards.
In English it has been called indifferently the " catchment basin," the " gathering ground," the " drainage area " and the " watershed."
The plateau or highland region which forms the waterparting between the Tarim basin on the east and the Syr-darya catchment area on the west.
In the Pleistocene period many large lakes were formed within the Great Basin; especially, by the fusion of small catchment basins, two great confluent bodies of water - Lake Lahontan (in the Nevada basin) and Lake Bonneville (in the Utah basin).