Lake Kozhozero Lake Kozhozero Lake Kozhozero () is a freshwater lake, located in the south of Onezhsky District of Arkhangelsk Oblast in Russia. It is one of the biggest lakes in Arkhangelsk Oblast and biggest one in Onezhsky District. The area of the lake is , and the area of its basin is . Lake Kozhozero is the source of Kozha River, which is a left tributary of the Onega River and thus belongs to the White Sea basin. The lake is located in the remote area and is not connected to the outside world by any all-season roads. It is notable
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