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

Expressions researched:
"In Jambudvipa there are nine divisions of land, each with a length of 9,000 yojanas" |"There are eight mountains that mark the boundaries of these divisions and separate them nicely"

SB Canto 5

In Jambūdvīpa 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.

SB 5.16.6, Translation and Purport:

In Jambūdvīpa 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.

Śrīla Viśvanātha Cakravartī Ṭhākura gives the following quotation from the Vāyu Purāṇa, wherein the locations of the various mountains, beginning with the Himalayas, are described.

dhanurvat saṁsthite jñeye dve varṣe dakṣiṇottare; dīrghāṇi tatra catvāri caturasram ilāvṛtam iti dakṣiṇottare bhāratottara-kuru-varṣe catvāri kiṁpuruṣa-harivarṣa-ramyaka-hiraṇmayāni varṣāṇi nīla-niṣadhayos tiraścinībhūya samudra-praviṣṭayoḥ saṁlagnatvam aṅgīkṛtya bhadrāśva-ketumālayor api dhanur-ākṛtitvam; atas tayor dairghyata eva madhye saṅkucitatvena nava-sahasrāyāmatvam; ilāvṛtasya tu meroḥ sakāśāt catur-dikṣu nava-sahasrāyama-tvaṁ saṁbhavet vastutas tv ilāvṛta-bhadrāśva-ketumālānāṁ catus-triṁśat-sahasrāyāmatvaṁ jñeyam.