Kistnah, Or Krishna, a large river of S. India, which rises in the Western Ghauts, at Maha-bulishwar, about 40 m. from the Malabar coast, and after a S. E. course of about 800 m. discharges its waters by many mouths into the bay of Bengal, near Masulipatam. Its principal tributaries are the Wurna, Malpurba, Gutpurba, Beemah, Toongabudra, and Mussy. It is subject to two periodical risings annually. The first and greatest is caused by the heavy rains of the S. W. monsoon, the other by those of the N. E. monsoon. The Kistnah is connected with the Godavery by a canal 90 m. long, and irrigates the adjacent country by numerous artificial channels. At Boburlanka, in lat. 16° 5' N., lon. 80° 56' E., it divides into two main branches, which diverge from each other in their progress to the sea, and form an extensive delta, intersected by less considerable branches. On account of the rapid declivity and rocky nature of its waterway, the Kistnah can hardly be anywhere navigated even by small craft; but in the lower part it has been made navigable by the government. In its upper course it is usually crossed in large circular bamboo baskets covered with hides.

It is richer in gems than any other Indian river.