great tract of jungle, swamp, and alluvial plain, forming the lower portion of the Ganges delta; extends from the Hooghly on the W. to the Meghna on the E., a distance of 165 m.; rice is cultivated on the upper part by a sparse population; the lower part forms a dense belt of wild jungle reaching to the sea, and is infested by numerous tigers, leopards, rhinoceroses, pythons, cobras, &c.