The Morro rock
The nine sisters are extinct volcano peaks which run in an approximately straight line for twelve miles, stretching from Morro Bay to San Luis Obispo. These peaks seperate the Los Osos and Chorro Valleys. The peaks are approximately 21 million years old. Davidson Seamount, disregarded as part of the chain, is submerged about 2 1/2 miles offshore of Morro Rock.
This area was the original home of the Chumash Indians, who made camps at the base of these peaks and ate the berries and roots found growing in the mountain sides. There is currently an effort being made to have the peaks named as historical landmarks, and thus preserved from further development.
Elevation 576 feet. It is also called "the Gibralter of the Pacific" and is probably the most famous peak. It was first sighted in 1542 by Juan Cabrillo. At one time it was surrounded by water. Quarrying was responsible for its shape, and rock from it supplied the breakwater for Morro Bay. It is now protected home for the endangered Peregrine Falcon.