SB 4.6.31
vaidurya-krta-sopana
vapya utpala-malinih
praptam kimpurusair drstva
ta arad dadrsur vatam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
They also saw that the bathing ghatas and their staircases were made of vaidurya-mani. The water was full of lotus flowers. Passing by such lakes, the demigods reached a place where there was a great banyan tree.