A river is generally a natural watercourse that runs perennially or seasonally from definite sources (e.g. hills, rivers, waterbodies), with defined banks, contributes to the water and sediment budget of the basin/catchment, and discharges into an outfall (e.g. rivers, waterbodies, Bay of Bengal). A socially and historically recognized watercourse will also be considered as a river.

North-West 318 28 346
North-Central 92 25 117
North-East 330 23 353
South-West and South-Central 113 280 394
South-East 60 33 93
Eastern-Hills 35 16 52
948 405 1355
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North-West 0 224 346
North-Central 46 30 117
North-East 32 140 353
South-West and South-Central 230 5 394
South-East 37 9 93
Eastern-Hills 22 9 52
603 744 1355
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North-West 1 345 346
North-Central 0 117 117
North-East 0 352 353
South-West and South-Central 318 75 394
South-East 14 79 93
Eastern-Hills 20 31 52
353 999 1355
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North-West 343 3 0 346
North-Central 117 0 0 117
North-East 353 0 0 353
South-West & South-Central 391 0 0 394
South-East 92 0 1 93
Eastern-Hills 52 0 0 52
1348 3 1 1355
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