JAKARTA — Best known as the home of the world’s rarest great ape, the mountainous Batang Toru forest landscape on the island of Sumatra has become a test case for whether Indonesia can enforce environmental law in a region where mining, energy and plantation projects overlap with fragile ecosystems. In late November 2025, a rare tropical cyclone, Senyar, swept across this part of northern Sumatra, bringing extreme rainfall that triggered flash floods and landslides in the provinces of Aceh, North Sumatra and West Sumatra. The disaster killed at least 1,178 people and displaced around 1 million others, according to government figures, making it one of Indonesia’s deadliest natural disasters in recent history. While the storm provided the immediate trigger, climatologists and environmental researchers say the scale of the destruction can’t be attributed to extreme weather alone. They point also to decades of deforestation, land clearing and landscape alteration that have weakened natural buffers across Sumatra’s upland watersheds. “Extreme weather was only the initial trigger,” Erma Yulihastin, a climate researcher at Indonesia’s National Research and Innovation Agency (BRIN), said at a recent public discussion in Jakarta on disaster risk. “The destructive impact was shaped by weakened environmental buffers upstream.” The government appears to have acknowledged this, with Environment Minister Hanif Faisol Nurofiq announcing on Dec. 23, 2025, an investigation into eight companies operating in the Batang Toru watershed, to assess whether their activities may have contributed to the floods and landslides. The ministry also ordered all eight companies to cease operations…This article was originally published on Mongabay
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