Bhagavatapurana 5.16.28

5.16.28

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meror mūrdhani bhagavata ātma-yoner madhyata upakḷptāṃ purīm ayuta-yojana-sāhasrīṃ sama-caturasrāṃ śātakaumbhīṃ vadanti //

28. On the summit of Meru, at the very centre is situated the city of the glorious Brahma, the son of Atman, occupying an area covering ten thousands of thousand yojanas, in the form of a square; and the learned call it *Satakumbhi* (the golden city).