The Palo Alto Baylands Nature Preserve, known officially as the Baylands Nature Preserve, is the largest tract of undisturbed marshland remaining in the San Francisco Bay. Fifteen miles of multi-use trails provide access to a unique mixture of tidal and fresh water habitats. The preserve encompasses 1,940 acres in both Palo Alto and East Palo Alto, and is owned by the city of Palo Alto, California, United States. It is an important habitat for migratory shorebirds and is considered one of the best birdwatching spots on the West Coast.
The Palo Alto Baylands is located at 37°27′35″N 122°06′23″W / 37.459608°N 122.106412°WCoordinates: 37°27′35″N 122°06′23″W / 37.459608°N 122.106412°W in Santa Clara County. The preserve consists of the former Yacht Harbor area, the Palo Alto Airport, the Municipal Golf Course, the Duck Pond and public picnic area, the Baylands Athletic Center, the Sailing Station, the Lucy Evans Baylands Nature Interpretive Center, the Harriet Mundy Marsh and the Palo Alto Flood Basin. The flood basin is bordered by Adobe Creek and Matadero Creek and is maintained a couple feet below sea level in order to serve as a catchment basin in case of flooding in lower Palo Alto. At the northwest edge the Baylands extend past San Francisquito Creek, although the creek used to flow into the Bay at the site of the former Yacht Club. In the late 1920s levees were constructed to re-route San Francisquito Creek away from its former mouth, to a sharp north turn for about half a mile, then to the northeast, before exiting to the Bay. Dredging of the former Yacht Club produced landfill for the filling of marshlands to construct the Palo Alto Airport and Municipal Golf Course. By 2004, filled areas such as the Palo Alto golf course and the Palo Alto Airport had reduced the tidal marsh to 352 acres (1.42 km2).