Sogra

Sogra is a stretch of forest and wetland in the northern river country east of the Vaga. The Vaga joins the Northern Dvina, whose waters flow north to the White Sea, while smaller rivers drain the surrounding wooded land. Bogs and thick forest make this a difficult country to cross, quite unlike the settled banks along the great rivers. The river valleys furnished the main routes through the interior toward Shenkursk and the White Sea.