where was the turning point on the eastern front in Europe?

Stalingrad where the whole German Sixth Army was wiped out by the Russians in the winter of 42/43

The German defeat at Stalingrad.Opening their attempt to capture the city on 19 August 1942,the German 6th Army was unable to drive the Russian defenders out. A Soviet counterattack on Army Group B cut off the 6th Army by 23 November.Unable to break out, and with relief attempts unsuccessful, the remaining Germans surrendered on 30 January 1943.A total of 210,000 Germans were killed or captured,and a further 25,000 wounded were evacuated by air before the surrender.