Lake Onega is relatively cold, with temperatures below for half of the year and average summer temperatures of about . The catchment area of drains into the lake via 58 rivers and more than 110 tributaries, including the Shuya, Suna, Vodla, Vytegra and Andoma. The only outgoing River Svir, which marks the southern boundary of Karelia, runs from the southwestern shore of Lake Onega to Lake Ladoga and continues as the Neva River to the Gulf of Finland. The White Sea–Baltic Canal runs through the lake from the White Sea to the Baltic Sea. The Volga–Baltic Waterway connects Onega Lake with the
Ermindo Onega old. Ermindo Onega Ermindo Ángel Onega (30 April 1940 – 21 December 1979) was an Argentine footballer, attacking midfielder and forward from River Plate. He played for River Plate from 1957 to 1968, scoring 98 goals in 222 matches. In 1972, he played for Club Atlético Vélez Sársfield, scoring 6 goals in 30 matches. Onega also had spells with Peñarol in Uruguay and La Serena in Chile. He was the older brother of Daniel Onega, also a River Plate footballer. Onega died in a road accident in 1979 on his way to the city of Rosario. He was only 39