The Sipiso-piso is a plunge waterfall in the Batak highlands of Sumatra, Indonesia. It is formed by a small underground river of the Karo plateau that falls from a cave in the side of caldera of Lake Toba, some 120 metres (390 ft) down to lake level.^[1] Sipiso-piso is a well-known tourist attraction and a nearby vantage point offers views of the falls and lake.

Sipiso-piso Waterfall
Sipiso-piso
Sipiso-piso waterfall drops from an opening on the rock face to the bottom
Location	Tanah Karo Regency, North Sumatra, Indonesia
Coordinates	2°54′59″N 98°31′11″E / 2.916416°N 98.519648°E / 2.916416; 98.519648
Type	Plunge
Total height	120 metres (390 ft)
Watercourse	Pajanabolon River

Sipiso-piso waterfall is located in the Tanah Karo regency in North Sumatra, at the northernmost tip of the Lake Toba caldera, near the fishing village of Tongging.^[1] The closest municipality is the town of Kabanjahe, about 25 km (16 mi) away,