Main Page | See live article | Alphabetical index Lake Onega (also known as Onego, Onezhskoe ozero, Onezhskoe lake) is a lake in Karelia, Russia. Its surface is 9'894 km² and volume 280 billion m³. It is the second largest lake in Europe. Related links Onega (disambiguation) This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.