Lake Itasca (/aɪˈtæskə/ eye-TASS-kə) is a small glacial lake, approximately 4.7 square kilometres (470 hectares; 1,200 acres) in area. It is located in Itasca State Park, in south-eastern Clearwater County, in the Headwaters area of north-central Minnesota, and is notable for being the headwater of the Mississippi River. It has an average depth of 20 to 35 feet (5 to 10 m) and is 1,475 feet (450 m) above sea level.