Ko Hong

Ko Hong is a small uninhabited limestone island in Phang Nga Bay within Ao Phang Nga National Park, administered as part of Ko Yao District in Phang Nga Province. Known for its enclosed sea lagoon (hong) accessible by kayak at suitable tides, the island features sheer karst cliffs, a small white-sand beach, clear emerald water and coral areas. It is visited on day boat tours from Ko Yao Noi, Phuket and Phang Nga for sightseeing, kayaking and snorkeling.

Visitors arrive by longtail or speedboat and can see towering limestone karsts surrounding a hidden interior lagoon (hong) open to the sky, a small curved white-sand beach with clear shallow water, and forested cliffs. The main areas to explore are the beach, the lagoon entrance for kayaking, shallow snorkeling areas, and a short trail to a viewpoint. The setting is undeveloped and natural, with no permanent settlement, managed as part of Ao Phang Nga National Park.

Part of Ao Phang Nga National Park established on 29 April 1981 to protect the karst landscape of Phang Nga Bay. The limestone karsts were formed during the Permian period and the bay has long been used by local fishing communities for shelter and fishing.

The name 'Hong' means 'room' in Thai, referring to the enclosed lagoon surrounded by cliffs that forms a natural chamber. The island is a well-known navigational landmark for Ko Yao communities and illustrates traditional local knowledge of the bay's tidal channels.