CC Madhya 20.218
sapta-dvīpe nava-khaṇḍe yāṅhāra vilāsa
“Within the universe the Lord is situated in different spiritual manifestations. These are situated on seven islands in nine sections. Thus Their pastimes are going on.
The seven islands are mentioned in the Siddhāntaśiromaṇi:
jambu-dvīpaṁ prāhur ācārya-varyāḥ
ardhe ’nyasmin dvīpa-ṣaṭkasya yāmye
krauñcaṁ ca gomedaka-puṣkare ca
dvayor dvayor antaram ekam ekaṁ
samudrayor dvīpam udāharanti
The seven islands (dvīpas) are known as (1) Jambu, (2) Śāka, (3) Śālmalī, (4) Kuśa, (5) Krauñca, (6) Gomeda, or Plakṣa, and (7) Puṣkara. The planets are called dvīpas. Outer space is like an ocean of air. Just as there are islands in the watery ocean, these planets in the ocean of space are called dvīpas, or islands in outer space. There are nine khaṇḍas, known as (1) Bhārata, (2) Kinnara, (3) Hari, (4) Kuru, (5) Hiraṇmaya, (6) Ramyaka, (7) Ilāvṛta, (8) Bhadrāśva and (9) Ketumāla. These are different parts of Jambudvīpa. A valley between two mountains is called a khaṇḍa or varṣa.