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
Port of Kerch Port of Kerch Kerch Marine Trade Seaport (, ) is one of the oldest ports of Black Sea (and Sea of Azov) located in the city of Kerch on the eastern shores of Kerch peninsula at Kerch Bay. The port has 10 piers. Port of Kerch is located in close proximity to the Black Sea waterways of oil transportation, international transport corridors and the Bosphorus (the exit to the Mediterranean Sea). The port is located on the shores of the Kerch -freezing bay . On the coast of the Kerch Strait coldest months - January, February. The prevailing wind -