The California Coastal National Monument is located along the entire coastline of the U.S. state of California. This monument ensures the protection of all islets, reefs and rock outcroppings along the coast of California within of shore along the entire long coastline. Conservative estimates are for at least 20,000 such outcroppings. The monument was created by Bill Clinton via Presidential proclamation on January 11, 2000, with the authority in section two of the Antiquities Act of 1906. , the monument has expanded to . The U.S. Bureau of Land Management, an agency of the U.S. Department of the Interior that manages the monument, has developed gateways in cooperation with other agencies along the California coast to introduce the monument to the public. These include the Trinidad, Point Arena, Fort Bragg-Mendocino, Pigeon Point Lighthouse, Piedras Blancas State Marine Reserve and Marine Conservation Area, and the Palos Verdes Peninsula. Although being the most-viewed national monument in California, people are usually unaware that the entire coastline is a national monument. Expansion The monument has seen two major expansions since its creation: Point Arena-Stornetta Public Lands On March 11, 2014, President Barack Obama used a presidential proclamation to add the Point Arena-Stornetta Public Lands to the monument. The proclamation added 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. The Point Arena-Stornetta Public Land was the first onshore segment of the national monument that visitors were allowed on. 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 sinkholes and unsteady cliffs. A bill adding this area passed the US House in 2013. California Coastal National Monument Expansion Act The California Coastal National Monument Expansion Act of 2017 added five coastal sites: at Lost Coast Headlands, at Trinidad Head, at Lighthouse Ranch in Humboldt County, from the Cotoni-Coast Dairies in Santa Cruz County and from Piedras Blancas in San Luis Obispo County. It also would include some small rocks and islands off the coast of Orange County. In January 2017, President Obama used his executive power under the 1906