or KRISHNAN, a celebrated river in the S. of India, which has its source in the Western Ghauts, not far from Sattara, in the province of Bejaapoor, which is only 50 miles in a direct line from the western sea-coast. It proceeds hence in a south-easterly direction until it reaches Merritch, when its bulk is greatly increased by the junction of the River Wurna, formed by a variety of streamlets that fall from the Ghauts. During its course eastward it is joined by the Malpurga, Guipura, Beemah, and Toombuddra rivers, and pours its prodigious volume of waters, by various mouths, into the Bay of Bengal, at or a little to the southward of Masulipatam, where it forms the northern boundary of the Guntoor Circars. Its course, including its windings, may be estimated at 800 miles in length. The Kistnah is subject to two periodical inundations annually, the first and principal being caused by the S.W. monsoon, and the other by the local rains brought by the N.E. monsoon. In consequence of the rapid declivity of its waterway and rockiness of channel, this river cannot be navigated, even by small craft. An extensive system of irrigation, in connection with this great stream, is now in progress, and is estimated to cost L.150,000. The object is proposed to be effected by means of an embankment thrown across the river at the head of the Delta, and by thus accumulating the waters, to extend the benefits of irrigation to large portions of the districts of Masulipatam and Guntoor. The term Krishnahan signifies black, or dark-blue, and is the name of the favourite deity of the Hindus, an incarnation of the preserving power of Vishnu. This river forms the boundary of the Deccan, according to the best Mohammedan authors.