The names of the islands are Jambū, Plakṣa, Śālmali, Kuśa, Krauñca, Śāka and Puṣkara. Each island is twice as large as the one preceding it, and each is surrounded by a liquid substance, beyond which is the next island.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
जम्बूप्लक्षशाल्मलिकुशक्रौञ्चशाकपुष्करसंज्ञास्तेषां परिमाणं पूर्वस्मात्पूर्वस्मादुत्तर उत्तरो यथासङ्ख्यं द्विगुणमानेन बहिः समन्तत उपकॢप्ताः
jambūplakṣaśālmalikuśakrauñcaśākapuṣkarasaṃjñāsteṣāṃ parimāṇaṃ pūrvasmātpūrvasmāduttara uttaro yathāsaṅkhyaṃ dviguṇamānena bahiḥ samantata upakḷptāḥ
SB 5.1.32