Ebe a na-agbasa n'ebe ugwu na ndịda n'akụkụ ọwụwa anyanwụ nke Osimiri Hooghly, Kolkata dị n'ime ala Ganges Delta nke ọwụwa anyanwụ India ihe dị ka 75 km (47 mi) n'ebe ọdịda anyanwụ nke ókèala mba na Bangladesh; elu obodo ahụ bụ 1.59 m (530 ft). Ọtụtụ n'ime obodo ahụ bụbu ala mmiri nke e weghachitere n'ime ọtụtụ iri afọ iji nabata ọnụ ọgụgụ na-eto eto. Ebe ndị fọdụrụ na-enweghị mmepe, nke a maara dị ka East Kolkata Wetlands, ka a kpọrọ "ala mmiri nke mba ụwa" site na Ramsar Convention (1975). Dị ka ọtụtụ n'ime Indo-Gangetic Plain, ala na mmiri na-abụkarị ala mmiri. Kolkata dị n'elu "Bengal basin", a pericary tertiary basin.
mpaghara ala ọma jijiji III