Sipisopiso
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The Sipisopiso is a plunge waterfall in the Batak highlands of Sumatra. It is formed by a small underground river of the Karo plateau that hurls itself from a cave in the side of the lake Toba caldera some 120 meters (360 feet) down to lake level. Sipisopiso is a well-known tourist attraction and a nearby vantage point offers great vistas of the fall and the lake.