Vishnupurana 2.4.p9

2.4.p9

In this way the seven insular continents are encircled by seven seas and each ocean and island is twice the dimension of that which precedes it. The water, in all these oceans, remains the same at all seasons and never increases or diminishes. Like the water in a cauldron, which expands in consequence of heat, the waters of the oceans swell with the increase of the moon, O foremost of Munis. Except in the light and dark fortnights the waters neither increase nor decrease. O great Muni, the rise and fall of the waters is five hundred and ten inches. In this island of Pushkara, O Brahman, foods are produced spontaneously and people there enjoy viands of various flavours.