Sihanoukville is Cambodia's primary coastal city, situated on the Gulf of Thailand in the southwest of the country. Known locally as Kampong Som, it serves as a hub for beach tourism and island access, with several offshore islands making it one of Southeast Asia's most accessible tropical island destinations.
The city itself has undergone dramatic and controversial changes since around 2017, when significant Chinese investment transformed much of the urban core with casinos and high-rise construction. This development altered the character of the city centre and of previously laid-back beaches such as Ochheuteal and Serendipity. Following the Cambodian government's ban on online gambling in 2019, much of this construction halted and the city is in a transitional phase, with the beach areas recovering their earlier character.
Otres Beach, located around 7 kilometres south of the city centre, remains the most appealing beach for independent travellers, with lower-key development and a more relaxed atmosphere. Independence Beach to the north retains a relatively peaceful setting and is accessed via the Independence Hotel grounds.
The offshore islands are the principal draw for many visitors. Koh Rong is the largest, approximately 45 kilometres from Sihanoukville by fast ferry, offering white-sand beaches and bioluminescent plankton in the surrounding waters after dark. Koh Rong Samloem to the south is smaller and quieter, popular with travellers seeking less developed conditions. Several smaller islands are accessible on day trips. The fast ferry to Koh Rong takes approximately 45 minutes.
Ream National Park, located about 18 kilometres east of the city, encompasses mainland forest, mangroves, estuaries, and 21 offshore islands. Boat tours through the park's waterways provide access to dolphin habitats and coastal bird populations. The park's condition varies with seasonal water levels.
The best time to visit Sihanoukville and its islands is November through April, when the Gulf of Thailand experiences calmer conditions and less rainfall. The monsoon season from May through October brings rough seas that limit access to some islands.