Markandeyapurana 53.30

53.30

ānandañca śivañcaiva kṣemakañca dhruvantathā /
plakṣadvīpādibhūteṣu śākadvīpāntimeṣu vai //

Medhātithi, the lord of Plakṣadvīpa had seven sons, and Plakṣadvīpa was divided into seven parts by the countries which were named after them, first the Śākabhava country, then Śiśira, Sukhodaya, and Ānanda, and Śiva, and Kṣemaka, and Dhruva.

In the five continents, which begin with Plakṣadvīpa and end with Śākadvīpa, righteousness also must be known as arising from the divisions of the castes and the several stages of a brāhman’s life. The righteousness which is settled,[9] and springs from one’s natural disposition, and is exempt from the rules of harmlessness is well-known to be universal in these five continents.