|Bair Island State Marine Park|
IUCN category V (protected landscape/seascape)
|Location||San Francisco Bay|
|Nearest city||Redwood City, California|
|Coordinates|| 37°31′48″N122°13′20″W / 37.5299362°N 122.2221881°W  |
|Area||3,398 acres (13.75 km2)|
|Governing body||US Fish and Wildlife Service, Don Edwards San Francisco Bay National Wildlife Refuge|
Bair Island is a marsh area in Redwood City, California, covering 3,000 acres (1,200 ha), and includes three islands: Inner, Middle and Outer islands.  Bair Island is part of the larger Don Edwards San Francisco Bay National Wildlife Refuge.  It is surrounded by the Steinberger slough to the northwest and Redwood Creek to the southeast.
The California Department of Fish and Wildlife's Bair Island Ecological Reserve consists of 1,985 acres (803 ha)  on the Middle and Outer islands, although the entire island group is managed by the Refuge. Bair Island is an important ecological wetland,  which provides critical habitat for a variety of species, including the endangered California clapper rail and the Salt marsh harvest mouse, and is an important stop for birds on the Pacific Flyway.  Bair Island is bisected by Corkscrew Slough,  a major haul-out site for harbor seals (Phoca vitulina). 
Bair Island is the largest undeveloped island in the San Francisco Bay and was used for farming, grazing and salt production since the 19th century.  A residential development called South Shores had been proposed to build a housing estate with 4000 houses on the marshland. It was approved by the Redwood City council, but a citizens referendum narrowly defeated the project in 1982 by just 44 votes.   The Peninsula Open Space Trust purchased the property in 1996 and deeded the site to be part of the Don Edwards National Wildlife Refuge,  and the Bair Island Ecological Reserve was established in 1997.  In 2013, a pedestrian bridge was opened to connect to trails around the island to allow access to the naturally restored wetlands.  In 2017, tour guides began leading pedestrians on the trails and showing the effects of wetland restoration.  Some species that have flourished since the restoration are the California Ridgway's rail, pickleweed, and pelicans. 
San Francisco Bay is a large tidal estuary in the U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the cities of San Francisco, San Jose, and Oakland.
Humboldt Bay is a natural bay and a multi-basin, bar-built coastal lagoon located on the rugged North Coast of California, entirely within Humboldt County, United States. It is the largest protected body of water on the West Coast between San Francisco Bay and Puget Sound, the second-largest enclosed bay in California, and the largest port between San Francisco and Coos Bay, Oregon. The largest city adjoining the bay is Eureka, the regional center and county seat of Humboldt County, followed by the city of Arcata. These primary cities, together with adjoining unincorporated communities and several small towns, comprise a Humboldt Bay Area with a total population of nearly 80,000 people. This comprises nearly 60% of the population of Humboldt County. The bay is home to more than 100 plant species, 300 invertebrate species, 100 fish species, and 200 bird species. In addition, the bay and its complex system of marshes and grasses support hundreds of thousands of migrating and local shore birds. Commercially, this second-largest estuary in California is the site of the largest oyster production operations on the West Coast, producing more than half of all oysters farmed in California.
Don Edwards San Francisco Bay National Wildlife Refuge (DESFBNWR) is a United States National Wildlife Refuge located in the southern part of San Francisco Bay, California. The Refuge headquarters and visitor center is located in the Baylands district of Fremont, next to Coyote Hills Regional Park, in Alameda County. The visitor center is on Marshlands Rd, off Thornton Ave.
The Goleta Slough is an area of estuary, tidal creeks, tidal marsh, and wetlands near Goleta, California, United States. It primarily consists of the filled and unfilled remnants of the historic inner Goleta Bay about 8 miles (13 km) west of Santa Barbara. The slough empties into the Pacific Ocean through an intermittently closed mouth at Goleta Beach County Park just east of the UCSB campus and Isla Vista. The slough drains the Goleta Valley and watershed, and receives the water of all of the major creeks in the Goleta area including the southern face of the Santa Ynez Mountains.
Ballona Wetlands Ecological Reserve is a protected area that once served as the natural estuary for neighboring Ballona Creek. The 577-acre (2.34 km2) site is located in Los Angeles County, California, just south of Marina del Rey. Ballona—the second-largest open space within the city limits of Los Angeles, behind Griffith Park—is owned by the state of California and managed by the California Department of Fish and Wildlife. The preserve is bisected generally east-west by the Ballona Creek channel and bordered by the 90 Marina freeway to the east.
Located in northern California, the Suisun Marsh has been referred to as the largest brackish water marsh on west coast of the United States of America. The marsh land is part of the San Francisco Bay tidal estuary, and subject to tidal ebb and flood. The marsh is home to many species of birds and other wildlife, and is formed by the confluence of the Sacramento and San Joaquin rivers between Martinez and Suisun City, California and several other smaller, local watersheds. Adjacent to Suisun Bay, the marsh is immediately west of the legally defined Sacramento-San Joaquin Delta as well as part of the San Francisco Bay estuary.
The Elkhorn Slough National Estuarine Research Reserve is a nature reserve that is located at 1700 Elkhorn Road in Watsonville, California. The reserve encompasses the central shore of Monterey Bay and is approximately 100 miles (160 km) south of San Francisco, California. The Elkhorn Slough is established as a part of the National Oceanic and Atmospheric Administration and is being managed as the Elkhorn Slough Ecological Reserve through the California Department of Fish and Wildlife.
The Napa Sonoma Marsh is a wetland at the northern edge of San Pablo Bay, which is a northern arm of the San Francisco Bay in California, United States. This marsh has an area of 48,000 acres (194 km2), of which 13,000 acres (53 km2) are abandoned salt evaporation ponds. The United States Government has designated 13,000 acres (53 km2) in the Napa Sonoma Marsh as the San Pablo Bay National Wildlife Refuge.
Seal Slough, also known as Marina Lagoon, is a narrow winding tidal channel through a tidal marsh in San Mateo and Foster City, California. This slough has been the object of a wetland restoration project in recent years to enhance habitat value. Dredging has been carried out in Seal Slough since at least 1954. When the original sewage treatment plant for the city of San Mateo was constructed in 1935, its discharge was directed to Seal Slough.
The Seal Beach National Wildlife Refuge is a wildlife refuge encompassing 965 acres (3.91 km2) located in the California coastal community of Seal Beach. Although it is located in Orange County it is included as part of the San Diego National Wildlife Refuge Complex. It was established in 1972.
Elkhorn Slough is a 7-mile-long (11 km) tidal slough and estuary on Monterey Bay in Monterey County, California. It is California's second largest estuary and the United States' first estuarine sanctuary. The community of Moss Landing and the Moss Landing Power Plant are located at the mouth of the slough on the bay.
Mowry Slough is a 5.8-mile-long (9.3 km) slough in Don Edwards San Francisco Bay National Wildlife Refuge and is the primary breeding ground for San Francisco Bay harbor seals. It is situated among the salt marshes and salt evaporation ponds in the city of Fremont.
San Pablo Bay National Wildlife Refuge is a 13,190-acre (53.4 km2) National Wildlife Refuge in California established in 1970. It extends along the northern shore of San Pablo Bay, from the mouth of the Petaluma River, to Tolay Creek, Sonoma Creek, and ending at Mare Island.
Grand Bay National Wildlife Refuge was established in 1992 under the Emergency Wetlands Resources Act of 1986 to protect one of the largest expanses of undisturbed pine savanna habitats in the Gulf Coastal Plain region. The refuge is located near Grand Bay, Alabama in Mobile County, Alabama and Jackson County, Mississippi, and when complete will encompass over 32,000 acres (130 km2). The refuge is part of the National Wildlife Refuge system. The Refuge Complex Manager also administers the Mississippi Sandhill Crane National Wildlife Refuge and Bon Secour National Wildlife Refuge. Access to refuge lands is limited, but is available mostly on the Mississippi side and by boat.
The San Diego National Wildlife Refuge Complex is a series of wildlife refuges established by the United States National Wildlife Service beginning in 1972. The complex incorporates five refuges in San Diego County and Orange County in California.
Eden Landing Ecological Reserve is a nature reserve in Hayward and Union City, California, on the eastern shore of San Francisco Bay. The reserve is managed by the California Department of Fish and Game and comprises 5,040 acres of former industrial salt ponds now used as a low salinity waterbird habitat.
Belmont Slough is a slough on the western shore of San Francisco Bay separating Redwood Shores and Foster City. It provides estuarine and marine deepwater habitats in its subtidal waters, which are characterized as brackish and saltwater.
Greco Island is a wetland island in Redwood City, California. Greco Island is part of the larger Don Edwards San Francisco Bay National Wildlife Refuge. Westpoint Slough follows the South side of the island while Redwood Creek is along the West. The San Francisco Bay bounds the North and East sides of the island.
The San Francisco Bay Salt Ponds are a roughly 16,500-acre (6,700 ha) part of the San Francisco Bay that have been used as salt evaporation ponds since the California Gold Rush era. Most of the ponds were once wetlands in the cities of Redwood City, Newark, and Hayward, and other parts of the bay.
Mallard II is a wooden-hulled clamshell dredger used to maintain levees on the San Francisco Bay Salt Ponds. Mallard II was constructed in 1936, and is "probably the oldest operating dredge in California"; she is owned and operated by Cargill Salt.