Arch of Cabo San Lucas, Rock formation in Cabo San Lucas, Mexico.

The Arch of Cabo San Lucas is a granitic rock formation at the southern tip of the Baja California Peninsula, where the Pacific Ocean becomes the Gulf of California. It stands three stories tall and was shaped by natural erosion. The arch separates Lovers Beach on the Sea of Cortez side from Divorce Beach on the Pacific side.

The basement rock of Los Cabos formed through intrusive igneous processes around 115 million years ago, during the Cretaceous period. The arch itself is a granitic formation shaped by natural erosion, standing three stories tall at the southern tip of the Baja California Peninsula.

Locals call the formation "El Arco" and fishermen have used it as a navigation marker for generations when returning to port. Visitors today pass through the stone gateway in small boats and experience the shift between calm and active waters on each side.

Water taxis depart from the marina in Cabo San Lucas to reach the rock formation and allow viewing from several angles close to the base. Most trips take around 15 minutes each way and run during daylight hours in good weather.

The Spanish source notes that in leap years the receding water lets boats pass beneath the arch, briefly forming the so-called Playa del Amor. Seen from the water, the rock is often compared to a triceratops drinking, and to Iceland's Hvítserkur arch.