ABSTRACTTourism visits to Cambodia have expanded rapidly, with over 5 million visitors arriving in the country by 2016. Angkor Wat remains the primary tourist attraction, but increasing numbers of tourists also visit ecotourism destinations. This study draws on Weaver’s [(2002). Asian ecotourism: Patterns and themes. Tourism Geographies, 4(2), 153–172] spatial and structural analysis of ecotourism in Asia as an organizing framework to develop a geography of ecotourism in Cambodia. In a comprehensive review of academic publications, reports, online ecotourism clearinghouses, and project websites, 30 Cambodian ecotourism sites were identified based on 5 ecotourism criteria. A content analysis of ecotourism project websites was then conducted to group together ecotourism sites with common characteristics in particular geographic regions. Each site was plotted on a Google Terrain map, and local and regional terrain, land cover, transport, and other physical features were analyzed, supplemented by detailed geographical data from Google Panorama, Earth, and Satellite map functions. Three relatively distinct ecotourism regions were identified: the (a) mangrove and rainforest region, (b) highland trekking region, and (c) wetlands and waterways region. For each region, tourism gateways and ecotourism development challenges and potentials are elaborated. The paper concludes with a discussion of study findings and their implications for ecotourism development in Cambodia.