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The Kra Isthmus (Thai: คอคอดกระ, pronounced [kʰɔ̄ː kʰɔ̂ːt kràʔ]; Malay: Segenting Kra) in Thailand is the narrowest part of the Malay Peninsula. The western part of the isthmus belongs to Ranong Province and the eastern part to Chumphon Province, both in Southern Thailand. The isthmus is bordered to the west by the Andaman Sea and to the east by the Gulf of Thailand.The Kra Isthmus marks the boundary between two sections of the mountain chain which runs from Tibet through the Malay peninsula. The southern part is the Phuket Range, which is a continuation of the Tenasserim Hills, extending further northwards for over 400 km (250 mi) beyond the Three Pagodas Pass.The Kra Isthmus is in the Tenasserim-South Thailand semi-evergreen rain forests ecoregion. Dipterocarps are the dominant trees in the ecoregion.