Alianza Ceibo unites four indigenous peoples in their struggle to counter environmental degradation to protect over 20,000 square kilometers of primary rainforest across four provinces and 70 communities in the Ecuadorian Amazon. In one of the world’s most biodiverse ecosystems, this indigenous-led alliance provides alternatives to extractive industries, ranching, and large-scale monocultures. Alianza Ceibo’s activities provide clean water to over 6,000 people, connect remote communities to solar power, and support women entrepreneurs. The alliance’s advocacy and ongoing legal accompaniment have led to the revocation of mine and oil concessions in indigenous territories. Participatory community mapping processes document the stewardship of Kofán, Siona, Secoya and Waorani peoples over their lands, and have initiated legal claims for community land title. Community patrols and monitoring trace illegal incursions into their territories, while indigenous youth train in documentary film-making and storytelling. Alianza Ceibo’s wide range of gender-responsive solutions is inspired by indigenous wisdom and traditional practice, aligning conservation and sustainable development in a significant carbon sink.