There's a lake in Africa that's a permanent sinkhole - Apparently.
Lake Natron, located in Tanzania, is a saltwater lake that's a permanent sinkhole. It's a shallow lake, only about 1 meter deep, but its water is so alkaline that it can calcify animals that die in its waters. The lake's pH level is around 10.5, making it one of the most alkaline bodies of water on Earth. This unusual chemistry creates a eerie landscape where the remains of dead birds and bats are preserved in a hardened, calcite coating.