Danau Toba is a large volcanic lake located in North Sumatra, Indonesia. It is the largest lake in Southeast Asia and one of the deepest lakes in the world, formed by a massive volcanic eruption approximately 74,000 years ago. The lake is about 1,145 square kilometers in size and is surrounded by stunning mountains and lush landscapes. In the center of Danau Toba lies Samosir Island, which is known for its rich Batak culture and traditional villages. The area is a popular tourist destination, offering activities such as hiking, swimming, and exploring local markets. The unique natural beauty and cultural heritage make Danau Toba a significant attraction in Indonesia.