Onega River traversed by ferry crossings. Onega River The Onega (; ) is a river in Kargopolsky, Plesetsky, and Onezhsky Districts of Arkhangelsk Oblast in Russia. The Onega connects Lake Lacha with the Onega Bay in the White Sea southwest of Arkhangelsk, flowing in the northern direction. The discharge at the source is and at the mouth is . The river is long, and the area of its basin . Its main tributaries are the Voloshka (right), the Kena (left), the Mosha (right), the Kodina (right), and the Kozha (left). The major tributary of the Lake Lacha is the Svid. The name
Lake Onega dace, silver bream, carp bream, sabre carp, spined loach, wels catfish, European eel, rudd, ide, gudgeon, pike-perch, European perch, ruffe and burbot. Whereas the area of the lake used to be clean, the pollution level is gradually increasing, especially in the northwestern and northern parts which contain the industrial facilities of Petrozavodsk, Kondopoga and Medvezhyegorsk. About 80% of the population and more than 90% of industry of the basin are concentrated in these areas. The pollution from these three cities amount to about of sewage and drainage water and of emissions per year. Human activity results in about of drain