Thelon River Upland

South of the Thelon River, the ancient rocks of the Canadian Shield rise into a broad northern upland. Lakes and stony glacial deposits break up the rolling surface, while tundra vegetation covers exposed heights. Farther north, the river crosses sandy plains on its way to Hudson Bay. Its sheltered valley supports stands of spruce in a landscape otherwise dominated by open tundra, an unusual extension of the forest into the barren grounds.