H5 



mountain system. On the north this system is bounded 

 by the obliquely truncating Rocky Mountain trench; and 

 on the south by the lava plateau of Washington. Toward 

 the west the Columbia mountains become less alpine and 

 assume a rough-plateau character, so that it is not possible 

 to make a clean-cut line of division from the adjacent 

 Belt of Interior Plateaus. This zone of topographic 

 transition is crossed by the railway in the region of the 





Looking south from Terminal Peak along the edge of the great escarpment bounding 

 the Purcell Trench on the west. 



Shuswap lakes. The Fraser valley at and in the vicinity 

 of Lytton forms a convenient and more definite limit 

 to the Belt of Interior Plateaus, on the west. 



The Coast range extends from the Fraser valley to 

 the structural depression occupied by the Strait of Georgia 

 and Queen Charlotte SDund, to the westward of which 

 is the Vancouver range of Vancouver island. On the 

 south the Coast range terminates at the transverse portion 

 of the Fraser valley, which also delimits the Cascade range 

 entering British Columbia from the United States. 



