Portal:Indonesia/POTW/18, 2007
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![](http://up.wiki.x.io/wikipedia/commons/thumb/a/a2/Sipisopiso_waterfall.jpg/200px-Sipisopiso_waterfall.jpg)
The sipisopiso waterfall at Lake Toba, North Sumatra. The waterfall 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.
Photo credit: Paaskynen.