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There's a lake that's actually a giant sinkhole

Lake Matano, located in Indonesia, is a massive crater lake that was formed when a mountain collapsed into itself, creating a sinkhole that was eventually flooded with water. This lake is a staggering 212 meters deep and has a surface area of approximately 66 square kilometers. The lake's unique formation has created a distinct water chemistry, with a pH level of around 4.5, making it one of the most acidic lakes in the world.