Mu Ko Similan, a granite archipelago in the Andaman Sea
Published on 08/15/2026 at 14:08 | Editorial responsibility: Rafael MĂĽller, Editor-in-Chief AD HOC NEWS
Mu Ko Similan, the Similan Islands of Phang Nga in southern Thailand, is a protected marine archipelago of granite islands rising from the Andaman Sea. The group forms Mu Ko Similan National Park, established as Thailand’s 43rd national park in 1982 and known for clear water, pale sand and reef-fringed shores.
Granite islands, reefs and rainforest
Mu Ko Similan is a continental archipelago in the Andaman Sea off the western coast of Phang Nga Province, south of the Thai mainland. The islands form a compact chain surrounded by deep blue water, with the park’s area extending over roughly 140 km² (54 sq mi) and a land portion of about 26 km² (10 sq mi) spread across the islands.continental archipelago Granite bedrock gives Mu Ko Similan its rounded hill profiles and scattered boulders, and rainforest covers the upper slopes above the beaches.
The national park comprises 11 named islands, extending roughly north–south in the Andaman Sea off Phang Nga. Koh Similan, also referred to as Pad or Similan, is the largest island in the group, while other islands include Bon, Ba Ngu, Miang, Hu Yong and Tachai among others.archipelago of 11 islands Coral reefs fringe many of the shorelines, and sand beaches lie between rock headlands, creating a sequence of bays around the islands.
From nine islands to Mu Ko Similan National Park
The name Mu Ko Similan refers to the original group of nine Similan Islands, which formed the core of the archipelago before the park boundaries were expanded. The marine national park was formally declared in 1982 as Thailand’s 43rd national park, protecting the islands and surrounding sea as a conservation area.Thailand’s 43rd national park Later that year, the designation brought the archipelago under a single management structure for both land and marine environments.
Mu Ko Similan National Park extends across the original Similan Islands and two further islands, Bon and Tachai, which lie to the north of the main group. The park office and main visitor centre are located on the mainland near Thap Lamu Pier in Lam Kaen, Thai Mueang District, providing the administrative base for the protected area.Mu Ko Similan National Park office Within the archipelago itself, ranger stations stand on Ko Miang and Ko Similan, supporting management on the islands.
Landscape and seascape of the Similan Islands
The islands are known for gently rounded granite hills covered in evergreen vegetation, dropping towards beaches that face reefs and open water. Above the waterline, smooth boulders and headlands mark the shoreline; below it, coral formations and clear sea create varied underwater terrain.granite islands topped with rainforest The combination of rainforest canopy, pale sand and reef platforms gives Mu Ko Similan its characteristic contrast between green interior and bright coastal edge.
Several islands carry dual names that reflect local usage, with Thai and alternative forms used alongside one another. Bon, Ba Ngu, Miang, Hu Yong, Similan and Tachai each mark a different part of the chain, some with bays and sheltered anchorages, others with longer stretches of outer coast exposed to the Andaman Sea.Similan archipelago consists of eleven islands Together they form a marine landscape where landforms, reefs and open sea sit within a single protected framework.
Visiting Mu Ko Similan: what travellers from Western Europe should know
- Mu Ko Similan lies off the coast of Phang Nga in the Andaman Sea, reached by boat from Thap Lamu Pier near Lam Kaen in Thai Mueang District.
- On the islands, terrain combines sand beaches, granite headlands and forested slopes, with paths and stairways climbing from landing points into the interior.
- The surrounding sea forms part of a marine national park, and boat trips from the mainland usually involve crossings over open water with exposure to swell.
- The official language is Thai and the currency is the 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 is an archipelago in the Andaman Sea off Phang Nga Province in southern Thailand, reached by boat from the mainland near Lam Kaen.
What can visitors expect on the islands?
Visitors encounter granite islands with rainforest slopes, sand beaches and coral reefs, with ranger presence on islands such as Ko Miang and Ko Similan.
What makes Mu Ko Similan distinctive?
Mu Ko Similan combines a chain of 11 granite islands, declared a national park in 1982, with protected marine and terrestrial landscapes inside a single archipelago.
