Sheshnetra is named after Sheshnag, the thousand-headed serpent deity upon whom Lord Vishnu is believed to rest during his cosmic slumber in the Milky Ocean. According to Hindu mythology, Sheshnag serves as a divine bed for Lord Vishnu, and it is from Sheshnag that the holy Alaknanda River emerges. Here is an introduction to Sheshnetra in Badrinath: