Samosir Island

Samosir Island is an island in Toba Lake. Toba Lake is a lake in Sumatra Island, Indonesia. It means that Samosir Island is an island in Sumatra Island. This unique earth feature, an island in an island was a result of geological process in Sumatra Island. Geological studies in Toba Lake indicated that the area was a super volcano which erupted about 75.000 years ago. 

The eruption released thousand meters cubic of ash to air, throwing it until thousand kilometer from it's origin place. Created a big holes on the earth that now known as Toba caldera. The geological progress beneath the hole continued to push the earth mantle upward, resulted an uplifted land on it. Slowly, water filled the hole until reached the Toba caldera maximum capacity to  current lake water level. The land on the caldera center  is known as Samosir Island.

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Now administratively, Samosir Island is a part of Samosir Regency in North Sumatra, Indonesia. Samosir Regency was a part of Toba Samosir Regency that originated from North Tapanuli Regency. North Tapanuli Regency was a regency in North Sumatra, but now the area have been divided to 4 regencies. They are North Tapanuli Regency as the origin regency, Toba Samosir Regency, Humbang Hasundutan Regency and Samosir Island.

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Geographically, Samosir Regency position is between 2 Degree 21’38’’- 2 Degree 49’48’’ North Latitude, and 98 Degree 24’00’’ - 99Degree 01’48’’ East Longitude.  Samosir Regency area elevation is between about 904 meters to 2.157 meters above sea level. The total area of its region about 2.069,05 square kilometer, consisted of about 1.444,25 square kilometer (69,80 percent) wide continent, that is the entire of Samosir Island that encircled by Lake Toba and some region of continent of  Sumatera Island. The Toba Lake water area that belong to Samosir Regency is about 624,80 square kilometer (30,20 persen) wide lake.