An unnamed sea natural arch, Mendocino County, California
Photos by Jay Wilbur (left) and Mike Higgins (right)
NABSQNO 10S-430070-4351590. This unnamed double sea natural arch has eroded through a remnant coastal stack composed of Franciscan Complex rock. It is located within the Mendocino Headlands State Park, Mendocino County, California. It is visible from several points along coastal walking trails in the park. Sea kayakers can gain a perspective that reveals its double nature. This arch was listed in the Vreeland catalog as number 21-8.4, and has a span of about 20 feet.