344 



A. E. CAMERON 



Fig. 3.^View of Alexandra Falls, Hay River, N.W.T., 

 looking upstream. (Photo by A. E. Cameron, 1916.) 



HAY AND BUFFALO RIVERS 



A trail leads overland from Vermilion, on Peace River, to Hay 

 River. For about 80 miles northwest from Vermilion it traverses 



a flat plain at 

 an elevation of 

 about 800 feet 

 above sea-level. 

 It then crosses 

 a low divide, the 

 summit being at 

 1,500 feet, and 

 enters the long, 

 narrow plain 

 area in the 

 center of which 



flows Hay River. The elevation of this plain at its upper end is 

 about 1,100 feet. Hay River 

 follows this plain in a north- 

 easterly direction for 150 miles, 

 dropping scarcely more than 

 two feet to the mile, until, 

 within 50 miles of its mouth, it 

 falls abruptly over an escarp- 

 ment into the basin of Great 

 Slave Lake, forming Alexandra 

 Falls (Figs. 3 and 4). 



SLAVE RIVER 



At Fort Smith the Slave 

 River cuts through a poorly 

 developed escarpment some 125 

 feet high. The crest of the 

 escarpment shows distinct evi- 

 dence of the shore-line condi- 

 tions in the form of well- 

 developed sand dunes and a j t. ,1 u 



■^ . 1, J -^^^- 4- — View of Alexandra Falls, Hay 



flat horizon to the north and River,N.W.T., showing closeviewof escarp- 

 east. West of Fort Smith at ment. (Photo by A. E. Cameron, 1916.) 



