There's a lake that's a perfect square
Lake Saelen, located in Norway, is a 1.8 km x 1.8 km lake that is a perfect square in shape. Its unique geometry is due to the fact that it was formed by glacial erosion, which carved out the surrounding rocks and created a square-shaped depression. According to the Norwegian Mapping Authority, the lake's shape has been verified by surveys and satellite imagery, and it remains one of the most unusual natural features in the region.