The park, established on 29 April 1981 and covering about 400 square kilometres, is mostly sea. Its islands are tower karst with sheer sides, topped with tropical forest, and it protects the largest remaining stretch of native mangrove in Thailand. Khao Phing Kan appeared in The Man with the Golden Gun (1974); beside it stands the slim pillar of Khao Tapu, which the Department of National Parks lists at about 20 metres.
The bay is more than one photograph. Channels lead into hongs, lagoons hidden inside the cliffs, and caves on Phanak Island and around the bay open to canoes. Koh Panyi is a stilt village inside the park boundary, though not run by the park. Plan a full day, go in the calmer months from November, and expect Khao Phing Kan to be crowded.