The California Coastal National Monument is located along the entire coastline of the U.S. state of California. Created by Presidential proclamation on January 11, 2000 with the authority in section two of the Antiquities Act of 1906 and expanded on March 11, 2014, the monument, which encompasses 2,272 acres (919 ha), is managed by the U.S. Bureau of Land Management, an agency of the U.S. Department of the Interior. The creation of the monument ensures the protection of all islets, reefs and rock outcroppings from the coast of California to a distance of 12 nautical miles (22 km) along the entire 1,100-mile (1,800 km) long California coastline. Conservative estimates are for at least 20,000 such outcroppings. There are currently five regulated gateways in which the monument can be accsesed; the Trinidad Gateway, Point Arena Gateway, Pigeon Point Gateway, Piedras Balncas-San Simeon Gateway, and Palos Verdes Peninsula Gateway.  The California Coastal National Monument is one of the most viewed national monuments in California, with millions of estimated annual viewers each year (Specific amount unknown due to the scale of the monument) who are usually not aware that they are viewing a national monument. 
On March 11, 2014, President Barack Obama used an executive proclamation to add the Point Arena-Stornetta Public Lands to the monument. The proclamation added 1,665 acres (674 ha) of onshore areas to the existing monument, comprising the estuary of the Garcia River. The Point Arena-Stornetta Public Lands is located on the Mendocino County Coast, north of the small town of Point Arena. Point Arena-Stornetta Public Lands will receive full federal protection and will be open to the public. As of this time the Point Arena-Stornetta Public Land will be the only land based segment of the national monument. Under federal protection the public is allowed to use the land for bird watching, fishing, picnicking, nature photography, and wildlife observation. Overnight camping and parking is prohibited. Along the coastal area there are numerous sink holes and unsteady cliffs.