Lake · Canada
Wollaston Lake
Wollaston Lake in northern Saskatchewan, Canada, is the largest lake in the world that drains naturally in two directions. Part of its water ends up in the Arctic Ocean, the rest flows to Hudson Bay.



Picture credit: C-FTFC (CC BY-SA 3.0) · Baf41 (CC BY-SA 4.0) · Gjcamp (CC BY-SA 4.0) · Wikimedia Commons
Where is Wollaston Lake?
Countries on its shores: Canada.
Middle of the lake: 58.25° N, 103.33° W
The story behind it
Wollaston Lake lies 398 m above sea level in the north of Saskatchewan, in Canada. Together with its islands it covers about 2 681 km²; the water alone covers about 2 286 km². It is the largest lake that lies completely inside Saskatchewan. What makes it special is that it has two outflows. About one tenth of its water leaves through the Fond du Lac River to the north-west. It reaches Lake Athabasca and finally, through the Mackenzie River, the Arctic Ocean. The other nine tenths flow through the Cochrane River to Reindeer Lake and on to Hudson Bay. The explorer David Thompson saw these two outlets in 1796 and wrote that they were “perhaps without parallel in the world”. Northern pike, Arctic grayling and walleye live in the lake. When the lake is frozen, a winter road crosses the ice; the rest of the year, a barge carries people across.
Find it on the globe
Wollaston Lake is there as a small blue dot with its name, right on the water. From far away the planet is only a blue ball; detail arrives as you zoom in, and this one appears once you are close enough. Open it on the globe.
It sits at its real coordinates, not near them — the same numbers listed in the facts above. Switch off the layer for this kind of place and it disappears again; the buttons for that are down the right-hand edge.
Questions children ask
How big is Wollaston Lake?
With its islands, Wollaston Lake covers about 2 681 km²; the water alone covers about 2 286 km². It is the largest lake completely inside Saskatchewan.
How can a lake flow in two directions?
Wollaston Lake has two outflows at different ends. About one tenth of the water flows north-west towards the Arctic Ocean, and nine tenths flow north-east towards Hudson Bay.
Who lives at Wollaston Lake?
On the shore lies the small community of Wollaston Lake, where the Hatchet Lake Dene Nation lives. The Woods Cree name of the lake means “at hatchet lake”.
Where these numbers come from
Every figure on this page was checked against public reference sources before publication. Where sources genuinely disagree, the text says so.
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