This image shows a typical section of the northern shore of Lake Superior, Ontario.
Alutone Reproductions by E. S. & A. Robinson (Canada) Limited, Leaside, Ontario
The description states:
CANADIAN LAKE SUPERIOR POST CARD SERIES
Rugged Northern coast line of Lake Superior.
–It is not obvious from the photo when it was taken, but the rest of this series dates from the 1950s and early 1960s.