Srimad-Bhagavatam: Canto 5 - Chapter 1 - Verse 28
Sanskrit:
मेरोर्मूर्धनि भगवत आत्मयोनेर्मध्यत उपक्लृप्तां पुरीमयुतयोजनसाहस्रीं समचतुरस्रां शातकौम्भीं वदन्ति ॥ २८ ॥
ITRANS:
meror mūrdhani bhagavata ātma-yoner madhyata upakḷptāṁ purīm ayuta-yojana-sāhasrīṁ sama-caturasrāṁ śātakaumbhīṁ vadanti.
Translation:
In the middle of the summit of Meru is the township of Lord Brahmā. Each of its four sides is calculated to extend for ten million yojanas [eighty million miles]. It is made entirely of gold, and therefore learned scholars and sages call it Śātakaumbhī.