About Ko Mai Si
Ko Mai Si is a small private coastal island in Trat Province, eastern Thailand, located southeast of Ko Kut and within Mu Ko Chang National Park. The island is known for its white sandy beach, clear turquoise water and fringing coral reef. It hosts a small private resort and is primarily visited on day trips and snorkeling tours from Ko Kut, Ko Mak and Ko Chang.
Visitors guide
Visitors can expect a small, low-lying tropical island with a curved white-sand beach, clear shallow water and coral reef close to shore. The interior is covered with coconut palms and light forest. Access is by private boat or snorkeling tour. Visitors can swim, snorkel, sunbathe and photograph the beach and sea. Facilities are limited to the private resort area, which is generally restricted to guests, while day visitors use the beach and snorkeling areas.
Key highlights
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Small private island with white-sand beach
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Clear turquoise water with fringing coral reef for snorkeling
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Part of Mu Ko Chang National Park archipelago
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Tranquil, undeveloped island setting near Ko Kut and Ko Rang
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Popular stop on island-hopping and snorkeling boat tours
History of Ko Mai Si
Ko Mai Si lies within Mu Ko Chang National Park, established in 1982 to protect the archipelago of more than 50 islands in Trat Province. The islands in this group have historically been fishing grounds and later developed for low-impact tourism.
Route
| By air | Fly to Trat Airport (TDX), then transfer by road to Laem Sok or Ao Thammachat pier and by ferry/speedboat to Ko Kut, then by private boat or tour boat to Ko Mai Si |
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| By public transport |