Andaman sea, Satun, Thailand. Large colonies of giant sea fan (Melithaea sp.) found in the waters of Koh Ya Kha, a small island in Mu Koh Tarutao National Park, Satun province, Thailand. With its location in the national park, the reefs at Koh Ya Kha is relatively undisturbed by human activities, boasting large colonies of corals in pristine condition.