Sierra Sea Causeway

The Sierra Sea Causeway is a is a fixed link composed of two parallel bridges in the Calisworth Archipelago connecting the two countries of Sierra and Vienna Blanca. It spans the Sierra Sea, the sea between the two countries. It carries 6 lanes of E45 (Einstein Expressway). With a total of 64.50 miles (72.23 km) long, it is one of the largest bridges in the world under water. It uses Florida’s bridge concrete sounds.