Mud Hole Spring is an unusual warm-water, submarine discharge of water off the southwestern Gulf Coast of Florida, at 26°15′51″N 82°01′02″W / 26.26417°N 82.01722°W, approximately 18.5 kilometres (11.5 mi) south of the Sanibel Island Light and Lee County, Florida. It discharges geothermally warmed and turbid water from the sea floor. The submarine feature is named "Mud Hole" because it produces a muddy plume of turbid water. The water is warm and rich in minerals. The warm water and abundant minerals create and support a lively submarine ecosystem.