Cape San Blas, Peninsula cape in Gulf County, Florida, US.

Cape San Blas is a natural peninsula extending westward from mainland Florida that forms a barrier between St Joseph Bay and the Gulf of Mexico. The area comprises roughly 1,900 acres of wilderness protected as a state park with sandy beaches, dune systems, and coastal forests along its length.

Cape San Blas hosted a Confederate saltworks that processed 150 US bushels (5.3 m3) of salt a day by evaporating seawater. In 1862 a landing party from the Union ship USS Kingfisher destroyed the works, ending salt production at the cape.

Cape San Blas takes its name from the Spanish saint Blas. The cape's best-known landmark is its lighthouse line: four towers were built between 1847 and 1883, and the iron-frame fourth tower still stands as a marker of the cape's maritime past. Visitors today see the low sandy shoreline and the pine-covered rise behind it.

Cape San Blas lies about 10 miles south-southwest of Port St. Joe, at the end of a road that Hurricane Michael damaged heavily in 2018, especially near the cape and inside St. Joseph Peninsula State Park, where a new inlet was cut. Check current road access before driving out. The cape itself is a low sandy shoreline backed by pines, with no tall buildings.

Four lighthouse structures were built here between 1847 and 1883, with three succumbing to severe weather before an iron-frame version finally succeeded. This succession of towers shows how storms shaped engineering decisions over time.