Markandeyapurana 54.4

54.4

mārkaṇḍeya uvāca
śatārdhakoṭivistārā pṛthivī kṛtstraśo dvija /
tasyā hi sthānamakhilaṃ kathayāmi śṛṇuṣva tat //

Mārkaṇḍeya spoke:
The earth is fifty times ten million yojanas[2] broad in every direction,[3] O brāhman. I tell thee of its entire constitution, hearken thereto. The dvīpas which I have mentioned to thee, began with Jambudvīpa and ended with Pubhkaradvīpa, O illustrious brāhman; listen further to their dimensions. Now each dvīpa is twice the size of the dvīpa which precedes it in this order, Jambu, and Plakṣa, Śālmala, Kuśa, Krauñca and Śāka, and the Pushkaradvīpa. They are completely surrounded by oceans of salt water, sugar-cane juice, wine, ghee, curdled milk, and milk, which increase double and double, compared with each preceding one.