Point Reyes National Seashore is a 71,028-acre (287.44 km2) park preserve located on the Point Reyes Peninsula in Marin County, California, USA. The Point Reyes peninsula is a well defined area, geologically separated from the rest of Marin County and almost all of the continental United States by a rift zone of the San Andreas Fault, about half of which is sunk below sea level and forms Tomales Bay. The fact that the peninsula is on a different tectonic plate than the east shore of Tomales Bay produces a difference in soils and therefore to some extent a noticeable difference in vegetation.
The peninsula includes wild coastal beaches and headlands, estuaries, and uplands, with a coastline that bears a striking resemblance to Cape Point, Cape of Good Hope, South Africa. Although parts of the Seashore are commercially farmed, and parts are under the jurisdiction of other conservation authorities, the National Park Service provides signage and seeks to manage visitor impact on the entire peninsula and virtually all of Tomales Bay. The Seashore also administers the parts of the Golden Gate National Recreation area, such as the Olema Valley, that are adjacent to the Seashore.
Some of Point Reyes National Seashore’s best and least crowded highlights are accessible only on foot, such as Alamere Falls, a freshwater stream that cascades down a 40-foot bluff onto Wildcat Beach.