A series of volcanic caverns, tunnels and chambers that span out of Isle of Kezan through the ocean floor, connecting to adjacent smaller islands to the west of Isle of Kezan.

• 卡赞岛底部遍布无数由火山形成的大型洞窟，隧道以及较小的洞穴，它们能跨海延伸到卡赞岛西面的小岛。