Koh Rong Island (Cambodia) – Location, History, Facts

Koh Rong Island is an island in the Gulf of Thailand off the southwest coast of Cambodia that combines coastal, marine, and forested environments.

Koh Rong Island, Cambodia.

Country: Cambodia

Koh Rong Island overview

Koh Rong Island is an island in the Gulf of Thailand off the southwest coast of Cambodia that combines coastal, marine, and forested environments. It lies within Preah Sihanouk Province and is notable for its size and diverse ecosystems. Koh Rong Island has an area of about 78 square kilometres, and it supports multiple permanent settlements and extensive fringing coral reefs that contribute measurable marine biodiversity values. The island is significant for ecological research and regional coastal dynamics.

Where Koh Rong Island is located

Koh Rong Island is located off the coast of Sihanoukville (Kampong Som) in Preah Sihanouk Province, southwestern Cambodia. Its approximate geographic coordinates are 10.73°N, 103.17°E, placing it in the Gulf of Thailand on the continental shelf. The island sits north of Koh Rong Samloem and is separated from the mainland by a shallow channel that contains numerous reef patches. Surrounding physical features include fringing coral reefs, mangrove fringes on sheltered bays, and the broader Koh Rong archipelago of smaller islets.

Why Koh Rong Island is important

Koh Rong Island matters for its combination of relatively large land area, varied coastal habitats, and active local fishing communities. Ecologically, the island supports fringing coral reefs, seagrass beds, and mangrove stands that sustain reef fishes and crustaceans recorded in regional surveys. Culturally, the island contains clustered settlements such as Koh Touch that reflect traditional coastal livelihoods and artisanal fishing techniques. Scientifically, marine biologists have used Koh Rong Island as a study area for coral condition, fish populations, and reports of bioluminescent plankton, distinguishing it from smaller, less varied Cambodian islets.

History of Koh Rong Island

Koh Rong Island formed as part of the Sunda Shelf with geological uplift and sedimentary processes shaping its bedrock and coastal deposits. Indigenous and Khmer-period coastal use included seasonal fishing and inter-island navigation long before formal mapping. During the colonial era the island was charted by European hydrographers and included on nautical charts used for regional trade. Post-colonial patterns show low-density settlements developing into concentrated village clusters, followed by phases of infrastructure change and economic diversification that altered land use and pressure on coastal resources without erasing long-standing fishing traditions.

Natural features of Koh Rong Island

The island’s physical structure combines sandy beaches, rocky headlands, interior wooded hills, and a network of small freshwater streams that drain to coastal bays. Fringing coral reefs form along leeward shores and in reef channels, creating distinct reef flats and reef slopes observable on marine surveys. Architectural features comprise timber dwellings on stilts, compact village layouts such as at Koh Touch, and modest piers and boat landings constructed for fishing and local transport. Vegetation ranges from coastal scrub to secondary tropical forest within the island interior.

Environment, protection, and monitoring of Koh Rong Island

Governance of Koh Rong Island involves Preah Sihanouk provincial authorities together with national agencies, notably the Ministry of Environment and the Fisheries Administration, which oversee conservation and resource management activities. Conservation themes include coral reef monitoring, mangrove maintenance, and community-based fisheries management programs supported by national and non-governmental organizations. Long-term management emphasises scientific monitoring, legal fisheries regulation, and coordinated stewardship by local communes and provincial institutions to address pressures from coastal development and marine resource use.

Koh Rong Island facts

Koh Rong Island was charted during the colonial mapping of the Gulf of Thailand and appears on early hydrographic charts of the Cambodian coast.
The island covers roughly 78 square kilometres, making it one of Cambodia’s largest offshore islands by land area.
Koh Touch and other settlements on the island reflect longstanding coastal fishing communities and associated cultural practices.
The surrounding waters of the island contain fringing coral reefs and seagrass beds that support documented reef fish assemblages.
Koh Rong Island has no UNESCO World Heritage designation and is managed under Cambodian national and provincial environmental and fisheries agencies.

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