Surasa is one among the numerous names of Narmada River. This holy river in Hinduism is known as Surasa because her waters destroy sin and pollution. Rasa means water.
Legend has it that once the sweat of Lord Shiva started gathering in a pond and it flowed down to earth to form Narmada River.
Another story says that River Narmada and River Sone were created from two teardrops of Lord Brahma, which fell on earth.