In Malaysian Borneo, systematic logging has wiped out huge tracts of rainforest. Now, Indigenous groups are turning to new tools to map and protect what remains.

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Long Moh, Sarawak — William Tinggang throws a handful of fish food into a glass-clear river.

A few seconds pass before movement under the water’s surface begins, and soon a large shoal splashes to the surface, fighting for the food.

He waits for the underwater crowd to disperse before hurling the next handful into the river. The splashing resumes.