The Structure of the Universe according to the Srimad-Bhagavatam Canto 5
"Each Dvipa is divided into Varsas bounded by mountains. The 6 outer Dvipas were all ruled by different sons of Priyavrata (son of Manu) except for Kusa-Dvipa whose king was a grandson. When each king retired, he divided his Dvipa amongst his sons, after which the Varsas are named. Each Dvipa has 4 Varnas corresponding to Brahman, Ksatriya, Vaisya, and Sudra (the 4 castes).
2. Plaksa - Sun
3. Salmali - Soma (Moon)
4. Kusa - Fire
5. Kraunca - Water
6. Saka - Wind
7. Puskara - Visnu seaton on lotus"
The Vedic description has an interesting correspondance to European alchemical descriptions of the universe from the middle ages.
Read the full text here: https://vedabase.io/en/library/sb/5/
Chapter 16 describing Jambudvipa: https://vedabase.io/en/library/sb/5/16/