Rahasya: Every pebble on Narmada's riverbed takes the shape of a Shivalinga

In mythological times, Shiva the lord of destruction sat meditating. His intense concentration made him break into a sweat. As it rolled down, it got collected in a tank. Eventually, this overflowed as the Narmada or Shankari, Shankar’s daughter. Every pebble on the riverbed is supposed to take the shape of a Shivalinga.