Lake Ellsworth (Antarctica)
Lake Ellsworth is a natural freshwater liquid subglacial lake located in West Antarctica under approximately 2.93–3.28 km (1.82–2.04 mi) of ice. It is approximately 14.7 km (9.1 mi) long and is estimated to be 156 m (512 ft) in max.
Source: Wikipedia — Lake Ellsworth (Antarctica) (CC BY-SA 4.0)