Uluan Peninsula is a peninsula jutting out into Lake Toba

Lake Toba

Lake Toba is a lake and supervolcano. The lake is 100 kilometres long and 30 kilometres wide, and 505 metres at its deepest point. Located in the middle of the northern part of the Indonesian island of Sumatra with a surface elevation of about , the lake stretches from to...

 on the eastern side towards Medan

Medan

- Demography :The city is Indonesia's fourth most populous after Jakarta, Surabaya, and Bandung, and Indonesia's largest city outside of Java island. Much of the population lies outside its city limits, especially in Deli Serdang....

, in Simalungun Regency

Simalungun Regency

Simalungun Regency is a regency in North Sumatra. Its seat is Raya. In 2000, the regency covered an area of 4369 square kilometres and according to the 2000 census it had a population of 855,591.The official Intercensal estimate for 2007 shows a population of 846,329...

 and Toba Samosir Regency

Toba Samosir Regency

Toba Samosir Regency is a regency in North Sumatra. Its seat is Balige. The regency covers an area of 3124.40 square kilometres and according to the 2000 census it had a population of 304,015 .-Orchid Paradise:...

 of North Sumatra province. It has experienced a large amount of uplift since the series of massive volcanic eruption that began 1.2 million years ago, the most recent 70,000 years ago and among the largest known eruptions on the planet. Uluan is located on the Porsea caldera, a part that erupted ca. 800,000 years ago. Parapat

Parapat

Parapat is a small town in North Sumatra province on the edge of Lake Toba, on the Uluan Peninsula where it forms the narrowest eastern link to Samosir Island. It is the primary transit point by ferry for visitors going to Samosir Island, and connected via Trans-Sumatran Highway to Pematang...

, the primary transit point for tourists going to the lake, is located on Uluan.