Lake Onega water per year, of which 46% are industrial and household water, 25% is stormwater runoff and 16% is melioration-related drainage. This drainage contains of phosphorus and of nitrogen; respectively of these elements are removed through the River Svir whereas the rest accumulates in the lake. Ships and motor boats (about 8,000 units) bring oil pollution at the level of about per navigation year, as well as phenols (), lead () and oxides of sulfur, nitrogen, and carbon. The lake basin is a major source of granite, marble and black schist in Russia which have been exploited in the area since
Onega Bay descendants) not later than in the 12th century. The selo of Soroki, currently Belomorsk, is known from that time. Most of the villages at the Onega Bay coast such as Purnema or Unezhma (now abandoned), are old Pomor villages, many of them still depend on fishery. Solovetsky Islands are on the World Heritage list, and there is intensive passenger sea traffic to the islands, mostly originating from Kem and Belomorsk. There are also regular but infrequent passenger connections between Arkhangelsk and the villages of the Onega Peninsula. Onega Bay The Onega Bay () is located in the Republic of Karelia