The Uluan Peninsula extends into Lake Toba on the northeastern side toward Medan, in Simalungun Regency and Toba Samosir Regency of North Sumatra province.
It has experienced a large amount of uplift because of a series of massive volcanic eruptions that began 1.2 million years ago.
Uluan is located on the Porsea caldera, a part of the volcano that erupted approximately 800,000 years ago.
[1] Parapat, the primary transit point for tourists going across the lake to Samosir Island, is located on Uluan.
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