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You asked:

is the ganges the longest river in the british isles

No. the River Ganges is not the most long river that is in British Isles.
river

river (a large natural flowing waterway)

British Isles

the British Isles (Great Britain and Ireland and adjacent islands in the north Atlantic)

the River Ganges

The Ganges (Sanskrit Ganga pronunciation, Devanāgarī:, as in most Indian languages), one of the major rivers of the Indian subcontinent, flowing east through the Gangetic Plain of northern India into Bangladesh