The earth consists of seven islands, many rivers, mountains and seven oceans. The Plaksha, Shalmali, Kush, Kraunch, Shak and Pushkar. Lord Shiva alongwith goddess Ambika and his ganas dwell in all these seven islands in one form or the other.
The name of the seven oceans are Ksharod, Rasod, Surod, Ghatodakshai, Dadhyarnav, Kshirod and Swadood. Lord Shiva manifests himself in all of them. Lord Shiva dwells in the ocean named Kshirarnav. King Priyavrata was the grandson of Manu, who ruled during Swayambhuva
manvantar. He had ten sons– Agnighra, Agnibahu, Meghatithi, Vasu, Vayushman. Jyotishman, Dyutiman, Havya, Savan etc. Priyavrata had made Aghnighra the king of Jambudweepa. Similarly the islands of Plakshadweepa, Shalmali, Kushadweepa, Kraunchdweepa, Shalvadweepa and Pushkar were given to Medhatithi, Vayushman, Jyotishman, Dyutiman Havya and Savan respectively. Havya had seven sons who became rulers and the different territories they ruled desired their names from them.