 Wollaston Lake's main inflow is the Geikie River which flows from the southwest into the southwest section of the lake.If Hudson Bay is considered an arm of the Atlantic Ocean, then the Geikie is the largest river in the world to flow naturally into two oceans.Wollaston Lake is also the largest lake entirely within Saskatchewan, although the Saskatchewanian portions of Lake Athabasca and Reindeer Lake are both larger.