Mu Ko Similan and its granite islands off Phang Nga
Published on 09/08/2026 at 16:41 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Mu Ko Similan is a granite island group in the Andaman Sea off Phang Nga in southern Thailand, known for sharp contrasts between dark rock, pale sand and clear water. The archipelago forms Mu Ko Similan National Park, established as Thailand’s forty?third national park in 1982, and its Malay?derived name is linked to the number nine.
Granite islands in the Andaman Sea
Mu Ko Similan is a continental archipelago rather than a chain of coral cays, with islands formed from exposed granite rising steeply from the sea. The group lies off the western coast of Phang Nga Province in the Andaman Sea, separated from the mainland by open water and reached by boat from ports on shore.continental archipelago in the Andaman Sea The national park covers a marine area of around 140 square kilometres (54 square miles), combining the island landmasses with reefs and surrounding waters in a single protected unit.area of approximately 140 square kilometres
The core of Mu Ko Similan consists of an island chain whose identity is tied to nine granite islands, a link reflected in the Malay word “sembilan”, meaning nine. Later additions brought Ko Bon and Ko Tachai into the protected area, extending the park’s reach northwards and bringing the total number of named islands to eleven.Similan archipelago consists of eleven islands Individual islands such as Ko Similan, Ko Payu and Ko Miang combine sloping granite slopes, pockets of vegetation and curved bays where sand collects between boulder outcrops.
Mu Ko Similan National Park and protection status
Mu Ko Similan was formally designated as Mu Ko Similan National Park in 1982, becoming Thailand’s forty?third national park and placing the archipelago under marine protection.Thailand’s 43rd National Park The park status covers both the islands and the surrounding sea, recognising the link between granite landforms above the surface and reef structures below. The designation frames Mu Ko Similan as a marine national park, with reefs, fish life and underwater visibility as central elements alongside the shorelines.
The park office for Mu Ko Similan stands on the mainland in Lam Kaen Sub?district in Thai Mueang District, with administrative contact based at an address in Phang Nga Province.Mu Ko Similan National Park, 93 Moo 5, Lam Kaen From the office and nearby pier at Thap Lamu, boats head out across the Andaman Sea towards the islands, linking the protected offshore archipelago to the coastal strip of Phang Nga.
Rock, reef and pale sand
The character of Mu Ko Similan rests on the meeting of three visible elements: granite rock, coral reef and pale sand. On shore, large rounded boulders and granite outcrops frame bays and short beaches, with vegetation tucked into hollows between rocks. Offshore, reefs fringe many of the islands, forming underwater slopes that mirror the granite above and support fish, corals and other marine life in clear water.pristine waters and vibrant coral reefs
Above the surface, the islands show a mix of steep rocky shores and gently shelving sandy stretches where boats anchor in what is often described as turquoise water. Some viewpoints on the granite heights give wide views across the Andaman Sea, taking in multiple islands and the contrast between dark rock and bright sea. Below the waves, the reefs and granite formations form passages and slopes that have made Mu Ko Similan a notable destination for diving within Thailand’s network of marine parks.marine protected area with exceptional underwater visibility
Visiting Mu Ko Similan: what travellers from Western Europe should know
- Mu Ko Similan lies off the coast of Phang Nga Province in the Andaman Sea and is reached by boat from mainland ports such as Thap Lamu Pier near Lam Kaen.
- The islands combine steep granite slopes, short sandy beaches and reef?fringed bays, so moving around ashore involves steps on rock, sand underfoot and boarding boats from the beach.
- The official language is Thai and the currency is the Thai baht.
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
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Frequently asked questions about Mu Ko Similan
Where is Mu Ko Similan?
Mu Ko Similan lies in the Andaman Sea off the coast of Phang Nga Province in southern Thailand, reached by boat from mainland ports such as Thap Lamu.
What can visitors expect on a visit to Mu Ko Similan?
Visitors encounter granite islands with short sandy beaches, clear water over coral reefs and boat access to bays and shorelines within a protected marine national park.
What makes Mu Ko Similan distinctive among Thailand’s coastal areas?
Mu Ko Similan combines exposed granite islands, reef?fringed bays and marine national park protection, with its identity closely tied to the number nine in its name.
