THE LA URENTIAN PENEPLAIN 



635 



nipeg, and on the peneplain, separates the headwaters of a few 

 short, westerly flowing streams from the waters of streams flowing 

 to Hudson Bay. All the waters from the river systems whose 

 chief streams are the English, Red, Assiniboine, and Saskatchewan 



Fig. 8. — Caribou on the banks of the Doobaunt River, Keewatin District. 



{Photograph by J. B. Tyrrell, July 30, 18^3.) 



Fig. 9. — Great Slave Lake, looking north from Fort Smith. 



[Photograph by J. W. Tyrrell, iqoo.) 



Rivers reach Lake Winnipeg (710') just on the margin of the 

 plain, and thence cross the plain in a broad shallow depression, 

 via the Nelson River to Hudson Bay. North of the Nelson the 

 Churchill River system also drains a considerable portion of the 

 central plains across the ancient peneplani. Still farther north 



