Deep in the Wanagiri highlands of northern Bali, two streams of crystalline mountain water plunge side by side into a single emerald pool — and most tourists never find it. Banyumala Twin Waterfalls sit at 900 metres elevation, surrounded by moss-draped volcanic rock and dense jungle canopy, with a swimmable pool cold enough to stop you mid-breath. The trek in is real. The solitude is rarer than almost anywhere else on the island. This is the complete guide to doing it right — from the drive up the ridge road to the moment you finally jump in.