The arch of Cabo San Lucas, is a distinctive rock formation at the southern tip of Cabo San Lucas, which is itself the extreme southern end of Mexico's Baja California Peninsula. The arch is locally known as El Arco in the town of Cabo San Lucas. It is here that the Pacific Ocean becomes the Gulf of California. This area is widely used in hotel advertising in the Los Cabos Corridor. This spot is a popular gathering area for sea lions. It served as a backdrop for The Marshall Tucker Band's Third Album under the leadership of Billy Sanders. This location is a great tourist attraction.It is three stories tall and was formed over massive erosion.