This is an image of a rock arch which spans an inlet of Lake Michigan on Mackinac Island, roughly between the Lower and Upper Peninsulas of Michigan.
Published by the Hiawatha Card Co., P.O. Box 56, Ypsilanti, Mich
The caption states:
ARCH ROCK
This natural rock formation, with a span of 50 feet, stands 149 feet above the blue waters of the Straits of Mackinac. There’s a beautiful view from the railing alongside, and this is one of the most photographed spots on the island. This scene is included on the Carriage Tours.
— Carriage tours are provided on Mackinac Island because no motorcars are allowed to land at the island, keeping the island in a state reminiscent of its history.
This card likely dates from the 1950s.