Onega River 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 of the river is
Arkhangelsk Governorate Arkhangelsk Oblast (and later the Arkhangelsk Viceroyalty) was subdivided into seven uyezds (the administrative centers, which all had the town status, are given in parentheses), Mezen, Onega, and Pinega were incorporated as towns in 1780 just to become the uyezd towns. Kola was incorporated in 1784. In 1801, portions of the Povenetsky Uyezd were transferred to the Olonets Governorate, while the Kemsky Uyezd, with its center in Kem, was left to remain in the Arkhangelsk Governorate. In 1854, the town of Kola was destroyed during the Crimean War, and Kolsky Uyezd was merged into the Kemsky Uyezd. In 1883, the