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. It is fifty-nine miles southeast of Panama City. The St. Joseph Peninsula extends northward from the west end of Cape San Blas. It is approximately 10 miles (16 km) 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.