This image shows the beach that lines the town of Biddeford Pool, Maine. The Pool is a tidal basin off of Sacco Bay.
Bicknell Mfg. Co., 16 Pitt St. Portland, ME
The description states:
BEACH, BIDDEFORD POOL, MAINE
–The pool is not particularly close to the town of Biddeford, and in fact is closer to the town of Kennebunkport, known as the home of the Bush family, source of two American Presidents.
This card likely dates from the 1930s.