Cape San Blas is part of a peninsula in Gulf County, Florida extending westward from the mainland of Florida, separating St. Joseph Bay to the north from the Gulf Of Mexico to the south. The St. Joseph Peninsula extends northward from the west end of Cape San Blas. It is approximately 10 miles south-southwest of the town of Port St. Joe, located at coordinates 29°39′49″N 85°21′20″W / 29.66361°N 85.35556°W.