This is an aerial view of the long expanse of beachfront known as Dennisport Beach, Massachusetts.
The description states:
AIR VIEW, DENNISPORT BEACH
CAPE COD, MASSACHUSETTS
This lovely beach is one of theist popular along Cape Cod’s scenic coastline.
–This beach is closely associated with the town of Dennis, Massachusetts, where the beach is now more commonly known as Sea Street Beach, a result of development and road construction along this stretch of sand.
Visible in the image are thin dark lines extending from the shore into the water, which are breakwaters intended to retard beach erosion. They are only partly effective in this.
This card was used and is dated 4 September 1957