Ko Khai

Ko Khai is a small uninhabited island in Ko Sarai Subdistrict, Mueang Satun District, Satun Province, southern Thailand, within Tarutao National Marine Park near the Malaysian border. It is known for its distinctive natural stone arch that forms a gateway in the sea, clear turquoise water, white sandy beach and fringing coral reef. The island is visited on day trips for sightseeing, photography and snorkeling and has no permanent development.

Visitors can expect a small, undeveloped tropical island with a short white-sand beach, clear shallow water and a prominent natural rock arch standing in the sea that is the main landmark. The interior is rocky and vegetated with limited shade. There are no shops, resorts or permanent structures. Access is by boat only, often as a brief stop on an island-hopping tour from Pak Bara. Activities are limited to walking on the beach, viewing and photographing the arch, swimming and snorkeling over fringing coral near the shore.

Ko Khai lies within Tarutao National Marine Park, established in 1974 as Thailand's second marine national park, which preserves the Tarutao archipelago's natural environment and island ecosystems