This project is led by Indonesian conservation practitioners and implemented by Yayasan Ulin in partnership with local Indigenous Dayak communities, village leaders, Indonesian universities, and relevant government authorities (BKSDA Kalimantan Timur). It aims to strengthen conservation of crocodilians and wetland biodiversity in Mesangat Wetland by integrating applied research, long-term monitoring, and community-led protection. The primary objectives are to (i) update and expand knowledge of the distribution, breeding activity, and habitat use of the Critically Endangered Siamese crocodile (Crocodylus siamensis) and the Sunda gharial (Tomistoma schlegelii); (ii) identify priority habitats and zones requiring protection through spatial mapping and integrated habitat and biodiversity monitoring; and (iii) reduce human-induced threats through community-based monitoring, rapid response to incidental capture, and improved coexistence practices. Research activities will be directly linked to conservation delivery, including targeted protection of nesting and refuge areas, improved response to incidental capture, and mitigation of human–crocodile conflict. Local community members will be trained and engaged as monitoring partners, contributing to data collection, threat detection, and stewardship. The project will produce a centralised database and practical outputs to support management, collaboration with stakeholders, and long-term monitoring, while building local research capacity through student involvement and hands-on training.