- Largest volcanic lake in the world, formed by a supervolcanic eruption 74,000 years ago.
- Located in North Sumatra, with a surface area of approximately 1,145 km².
- Depth reaches up to 400 meters, and contains an island called Pulau Samosir.
- Offers stunning scenery, with lush vegetation and turquoise waters.
- Popular for water activities such as boating, swimming, and fishing, as well as cultural experiences with the local Batak people.
2. Lake Maninjau (West Sumatra)
- Volcanic lake situated in West Sumatra, surrounded by steep volcanic cliffs and lush forests.
- Has an area of approximately 99.5 km², with a maximum depth of around 169 meters.
- Known for its unique caldera setting and picturesque landscapes.
- Offers recreational activities like fishing, boating, and exploring nearby traditional villages.
- The lake is also famous for its production of tilapia fish.
3. Lake Sentarum (West Kalimantan)
- Located in West Kalimantan, Borneo, Lake Sentarum is a vast freshwater swamp ecosystem.
- Covers an area of approximately 1,342 km², forming the largest lake in Kalimantan.
- Consists of a complex system of interconnected lakes, swamps, and rivers, teeming with diverse flora and fauna.
- Home to various endangered species such as the Bornean orangutan, proboscis monkey, and blackwater fish.
- Popular destination for nature lovers and wildlife enthusiasts, who can explore the area by boat or on foot.
4. Lake Poso (Central Sulawesi)
- Situated in Central Sulawesi, Lake Poso is surrounded by steep mountains and verdant landscapes.
- Covers a surface area of around 320 km², with depths reaching up to 450 meters.
- Known for its serene beauty and diverse ecosystems, ranging from lowland rainforests to submontane forests.
- Offers opportunities for ecotourism activities, including jungle trekking, bird watching, and canoeing.
- Local attractions also include the ancient megalithic sites around Danau Poso.
5. Lake Sentani (Papua)
- Located in the northern part of Papua province, Lake Sentani is the largest lake in Indonesian Papua.
- Covers an area of approximately 936 km², with depths reaching up to 22 meters.
- Known for its scenic beauty, surrounded by lush hills and diverse ecosystems.
- Offers various recreational activities, including boating, fishing, and bird watching, as well as cultural experiences with the indigenous Papuan tribes.
- Also features historical significance, as it was the site of the first contact between Dutch explorers and the local population in the 16th century.