Ecotourism is a sustainable tourism method that uses local ecosystems and community culture to preserve nature and generate benefits. Tangkahan, an ecotourism area in Indonesia, has a history of forest exploitation and illegal logging. The local community is working to make it a sustainable conservation area. This research will explain Community-Based Sustainable Ecotourism in Tangkahan Tourism Destination, Langkat Regency. This descriptive research uses a qualitative approach, in-depth interviews, FGDs, observations, and focus group discussions, and uses data analysis techniques as suggested. The results showed that the management of Tangkahan Ecotourism involved cooperating parties such as the North Sumatra Natural Resources Conservation Centre, Gunung Leuser National Park Centre, Forest Management FMU, Conservation Response Unit, PT Perkebunan Nusantara II, Tourism Office, and two Tangkahan Tourism Area Villages namely Namo Sialang Village and Serdang Village. The Tangkahan Tourism Board manages the area, including marketing, guide services, and rescue efforts. However, land licensing issues, trust, and access difficulties hinder development. The development model should be open and community-based, integrating ecotourism development with other community activities. Critical programs include regulatory regulations, tourist facilities, infrastructure, human resources, cooperation, and collaboration with relevant parties.