長阿含經 30.p93

30.p93

“Beyond that open region, there’s an ocean in an open area named *Ujanna (?). There’s a noble wheel-turning king’s road beneath this sea that’s twelve yojanas wide. On both sides, the road is bordered by seven walls, seven balustrades, seven nettings, and seven rows of trees that are decorated all around and made the seven treasures. When a noble wheel-turning king arises in the land of Jambudvīpa, that sea naturally recedes to expose the road just above its surface.