12 Emerging Southeast Asian Islands That Belong on Your Must-Explore List

8. Koh Thmei, Cambodia

Completely enveloped by the lush expanse of Ream National Park, Koh Thmei is a pocket of true wilderness for those who value pristine nature and a total digital detox. You won’t find Wi-Fi cafes or party crowds—just miles of unspoiled beach, dense mangroves, and wildlife in abundance, from fishing eagles to elusive otters. Accommodations are as off-grid as they come: a single solar-powered eco-lodge blends seamlessly into the landscape, and tourism here is managed with utmost respect for the environment. Days fill with bird-watching, forest hikes, dolphin-watching boat rides, or simply relaxing on near-deserted shorelines. Reaching Koh Thmei involves a taxi ride from Sihanoukville to Ream, followed by a short boat trip. The dry season, from November to April, brings the clearest skies and the richest wildlife encounters. If you’re searching for unplugged simplicity and authentic wilderness in Southeast Asia, this emerging island sanctuary deserves a spot on your journey.