San Bruno Mountain is a fault-block horst in northern San Mateo County, California; its northern slopes rise in San Francisco. It is surrounded by San Francisco Bay and the cities of Brisbane, Colma, Daly City, and South San Francisco, and has played an important role in the history of all these communities.

Brisbane is a small city in San Mateo County, California, located on the lower slopes of the San Bruno Mountain. The city is on the northeastern edge of San Mateo County, located immediately south of the San Francisco city limits on the San Francisco Bay. The population was 4,851 as of the 2020 census.