One verse

Srimad Bhagavatam 5.16.6

5.16.6

यस्मिन्नव वर्षाणि नवयोजनसहस्रायामान्यष्टभिर्मर्यादागिरिभि: सुविभक्तानि भवन्ति ॥ ६ ॥

yasmin nava varsani nava-yojana-sahasrayamany astabhir maryada-giribhih suvibhaktani bhavanti.

yasmin
in that Jambudvipa
nava
nine
varsani
divisions of land
nava-yojana-sahasra
72,000 miles in length
ayamani
measuring
astabhih
by eight
maryada
indicating the boundaries
giribhih
by mountains
suvibhaktani
nicely divided from one another
bhavanti
are.

In Jambudvipa there are nine divisions of land, each with a length of 9,000 yojanas (72,000 miles). There are eight mountains that mark the boundaries of these divisions and separate them nicely.