There's a 60-mile-wide underwater lake in the Pacific - Apparently.
In the middle of the Pacific Ocean, approximately 650 miles northeast of Hawaii, lies the Envisat ocean lake, a 60-mile-wide underwater body of water that's higher in elevation than the surrounding seafloor. This phenomenon was discovered by satellite imaging in 2001. The lake is thought to be a remnant of a volcanic caldera that collapsed and was flooded with seawater.