Concordia Subglacial Lake is a subglacial lake located beneath an ice sheet 3,850m (12,630ft) to 4,125m (13,533ft) thick. It has a surface of about 800km2(310sqmi) and is ~ 300m (980ft) deep. The sloped surface of the water has an elevation from 623m (2,044ft) to 898m (2,946ft) below mean sea level. The elevation of the icecover, above Concordia Subglacial Lake is: 3,227m (10,587ft) m.a.s.l. It was first located in December 1999; the name derives from the nearby French-Italian Concordia Research Station.