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The Ketepu Peak in Merabu Village is a karst tower, a small part of the vast Sangkulirang-Mangkaliat karst region in East Kalimantan. From the village, it is reached by navigating the Lesan River using a small boat. About 25 minutes of the roaring sound of the outboard engine echoes, breaking through the entire forest. Agilely, the boatman, several times,...