2Enakshi Ganguly = ""The story of Krishna, and Kaliya the serpent is very well known. Kaliya, a naga (a serpent), had been occupying the river Yamuna and its banks.It had poisoned the waters of the Yamuna and also dried the forests nearby by the poison airs breathed by it. Krishna jumped into the water to kill the serpent. He was coiled around by Kaliya, the serpent king and he lay at the bottom of the river. But then he soon was reminded of his divine powers and exercising his powers he uncoiled himself from the serpent and danced on the head of the serpent and wanted to kill it. But on imploration from the wives of Kaliya, he left it alone and asked them all to leave the shores of Yamuna. So they left and Yamuna and its shored regained their normal form. This feat is termed as Kaliya-Daman."Source: http://indianmythology.com/finish/seestory.php?storyID=146"