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," which means "the arch" in Spanish, or "Land's End."
Text found at https://en.wikipedia.org/wiki/Arch_of_Cabo_San_Lucas
The sunlight that strikes the cliffs has a dematerializing effect that permitted the artist to interpret the cliff almost exclusively in terms of color and luminosity.
Monet painted a similar dramatically arched projection in the cliff at Étretat
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