The Mahakam River flows for 900 km from the highlands of central Borneo through thick rainforest before fanning into a lush delta that feeds the Makassar Strait. Once dense with mangroves and palms, the wetland islands protected coastal communities, supported biodiversity and served as a significant carbon sink.

However, in the 1980s, shrimp ponds began replacing the mangroves. By 2020, around half of the delta’s forests were lost due to weak regulatory enforcement and inadequate environmental protection. This large-scale deforestation increased the area’s vulnerability to climate change.