According to Puranic cosmography, the world is divided into seven concentric island continents (sapta-dvipa vasumati) separated by the seven encircling oceans, each double the size of the preceding one (going out from within). The seven continents of the Puranas are stated as Jambudvipa, Plaksadvipa, Salmalidvipa, Kusadvipa, Krouncadvipa, Sakadvipa and Pushkaradvipa.
Seven intermediate oceans consist of salt-water, sugarcane juice, wine, ghee, yogurt, milk and water respectively.
The mountain range called Lokaloka, meaning "world-no-world", stretches across this final sea, delineating the known world from the dark void.
Jambudvipa, also known as Sudarśanadvīpa, forms the innermost concentric island in the above scheme. Its name is said to derive from the jambu tree, Syzygium cumini. The fruits of the jambu tree are said, in the Viṣṇupurāṇa (ch.2), to be as large as Asian 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 the 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).
The Markandeya Purana portrays Jambudvipa as being depressed on its south and north and elevated and broad in the middle. The elevated region forms the varsha named Ila-vrta or Meruvarsha. At the center of Ila-vrta lies the golden Mount Meru, the king of mountains. On the summit of Mount Meru, is the vast city of Brahma, known as Brahmapuri. Surrounding Brahmapuri are eight cities – the one of Indra and of seven other Devatas.
Markandeya Purana and Brahmanda Purana divide Jambudvipa into four vast regions shaped like four petals of a lotus with Mount Meru being located at the center like a pericarp.
The city of Brahmapuri is said to be enclosed by a river, known as Akasha Ganga. Akasha Ganga is said to issue forth from the foot of Vishnu and after washing the lunar region falls "through the skies" and after encircling the Brahmapuri "splits up into four mighty streams", which are said to flow in four opposite directions from the landscape of Mount Meru and irrigate the vast lands of Jambudvipa.[10]
The common names of the dvīpas, having their varṣas (9 for Jambu-dvīpa, 7 for the other dvīpas) with a mountain and a river in each varṣa, is given in several Purāṇas. There is a distinct set of names provides, however, in other Purāṇas.[
The detailed geography is that described in the Vāyu Purāṇa.