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 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,