They (the three great mountains named Nisadha, Hemakuta and Himalaya) mark the boundaries of the three varsas named Hari-varsa, Kimpurusa-varsa and Bharata-varsa (India)

Expressions researched:
"They mark the boundaries of the three varsas named Hari-varsa, Kimpurusa-varsa and Bharata-varsa"

SB Canto 5

South of Ilāvṛta-varṣa and extending from east to west are three great mountains named (from north to south) Niṣadha, Hemakūṭa and Himālaya. Each of them is 10,000 yojanas (80,000 miles) high. They mark the boundaries of the three varṣas named Hari-varṣa, Kimpuruṣa-varṣa and Bhārata-varṣa (India).

SB 5.16.9, Translation:

Similarly, south of Ilāvṛta-varṣa and extending from east to west are three great mountains named (from north to south) Niṣadha, Hemakūṭa and Himālaya. Each of them is 10,000 yojanas (80,000 miles) high. They mark the boundaries of the three varṣas named Hari-varṣa, Kimpuruṣa-varṣa and Bhārata-varṣa (India).