This image shows an overlook of what is most likely Lake Superior from the shores of Upper Michigan.
Curteichcolor Reproduction from Kodachrome or Ektachrome Original
The description states:
K-16 — A NORTHWOODS VIEW IN NATURAL COLOR
Island-dotted lakes and forests of stately pine, spruce, balsam and white birch enjoyed by everyone vacationing in the seemingly endless north country.
–This card was used and is dated 15 August 1956