Koh Seh (Khmer: កោះសេះ, also romanized as Kaoh Seh and its former French name Ile a l'eau) is a Cambodian island located in the Gulf of Thailand, inside Ream National Park, Sihanoukville province. It lies south of Koh Thmei and around south of the main-land of Sihanoukville's Ream commune. A wide sound separates it from Phu Quoc. "Koh Seh" means Horse Island. Less than 400 meters south-west of Koh Seh lies the tiny islet of Koh Ky.
Koh Seh is uninhabited while most of its shores are fringed with mangroves. The island constitutes the south-easternmost part of Ream National Park.
Koh Seh is sometimes mistaken with Koh Ach Seh, located in Kep Archipelago.
See also Koh Thmei Ream National Park Koh Rong Sanloem Koh Rong Koh Sdach List of islands of Cambodia List of Cambodian inland islands Sihanoukville
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