Formed by a stupendous prehistoric volcanic explosion, the 100 km long lake is the largest is Southeast Asia and one of the deepest and highest in the world. The drama of that cataclysmic birth persist in 500 meter cliffs dropping into the blue-green waters, Surrounded by steep, pine covered sloped, the climate is fresh and pleasant, with just enough rain to support the lush vegetation.

Samosir, the large island in the center of the lake, is the home of the Toba batak, considered -at least by the Toba Batak - as the original Batak tribe. One of the prominent ethnic groups in the archipelago, Bataks living in distant cities will regularly return to their ancestral island. Even people not sharing the spiritual and historic connection with the island often return to Samosir, drawn by the enchanting natural beauty and fascinating culture.

Three megalithic sites on Samosir bear witness to the glory - and horror - of Batak history. The three consist of 300-year-old stone seats and benches arrayed in a circle. The first set of ruins was used as a conference area for Batak kings. At the second site, the rajas would sit in judgment of a criminal or enemy prisoner. If the accused were found guilty, the assembly would move to the third set, which features the ghastly addition of a central stone execution block.

Other, less gruesome attraction can occupy many days of exploration and discovery. All over the island are superb examples of traditional Batak houses, with elaborate carvings and decorations. Performance of life-size is Gale-gale wooden puppet are held frequently, and at any moment, the musical Batak might break into a impromptu song, the seeming effortless, multi-part harmonies belying the casual setting.

Now, students and young professionals on tight budget have a good value accommodation, restaurants and general cosmopolitan atmosphere remain. With few motor vehicles, the island is a walker's paradise. Local guides are available for numerous hikes of varying difficulty around the island and surrounding lakeshore. Those who complete the 1600 meter climb up muddy trails to the village of Roonggurni need not be proud of their accomplishment: village children descend and re-climb the mountain every day to attend school.