On the banks of which river is Patna located?

including the Ganga, Son, Gandak, and Punpun. Option A (“Son”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Option C (“Gandak”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Option D (“Kosi”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Therefore the correct option, index and explanation consistently identify Ganga. Patna, the capital of Bihar, is located on the south bank of the Ganga River. Patna is one of the oldest continuously inhabited places in the world, known historically as Pataliputra. The city lies at the confluence of several rivers including the Ganga, Son, Gandak, and Punpun.