Continent Jambudvipa ("Indian Blackberry Island"), also known as "Sudarshanadvipa", forms the innermost concentric island in the above scheme. Its name is said to derive from a Jambu tree (another name for the Indian Blackberry). The fruits of the Jambu tree are said, in the Viṣṇupurāṇa (ch.2) to be as large as elephants and when they become rotten and fall upon the crest of the mountains, a river of juice is formed from their expressed juice. The river so formed is called Jambunadi (Jambu river) and flows through Jambudvipa, whose inhabitants drink its waters. Insular continent Jambudvipa is said to comprise nine "varshas" (zones) and eight significant "parvatas" (mountains).