The Barents–Kara Ice Sheet was an ice sheet which existed during the Weichselian Glaciation. It is named after the seas it was centred upon: Barents Sea and Kara Sea. During the periods 90–80 ka and 60–50 ka, the produced ice-damming resulted in the creation of lakes and a significant rerouting of drainage in northern Eurasia, including the major rivers Yenisei, Ob, Pechora and Mezen that now flow northwards.