SB 5.16.11
mandaro merumandarah suparsvah kumuda ity ayuta-yojana-vistaronnaha meros catur-disam avastambha-giraya upaklptah.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
On the four sides of the great mountain known as Sumeru are four mountains — Mandara, Merumandara, Suparsva and Kumuda — which are like its belts. The length and height of these mountains are calculated to be 10,000 yojanas [80,000 miles].