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Martins Beach at sunset in Half Moon Bay, California

Half Moon Bay is a coastal city in San Mateo County, California, United States, located approximately 25 miles (40 km) south of San Francisco. Its population was 11,324 as of the 2010 census. Immediately at the north of Half Moon Bay is the Pillar Point Harbor and the unincorporated community of Princeton-by-the-Sea. The urban area had a population of 20,713 at the same census. Half Moon Bay is known for Mavericks, a big wave surf location.