Koh Khai Sea Arch

         Khai Islet is about 300 meters long and 100 meters wide consisting of two rocky islets connected by a sand deposit, tombolo. The rock is made of softer sandstone with joints in different intervals with harder iron oxide deposited in the joint spaces generated boxworks in some places. A sea arch has been developed in the north islet with a stunning pose in the intertidal zone and has been regarded as a tourism symbol of Satun Province.