There's a lake that's a giant crater - Apparently.
Lake Hillier, located in Western Australia, is a saline lake that is a natural saltwater crater, formed about 2 million years ago. The lake's water is a vibrant pink color due to the presence of a type of algae. Measuring approximately 600 meters (2,000 feet) in diameter and 50 meters (164 feet) deep, Lake Hillier is a unique geological feature, surrounded by a ring of sand dunes. Its origin is attributed to the collapse of a volcano or a salt dome, which created the crater-like depression.