1898 Mare Island earthquake

Skaggs Island Naval Communication Station is a former United States Navy installation located near California State Route 37 between Novato and Vallejo, California. It was a secretive, secure, and self-contained naval base, engaged in a number of communications and intelligence gathering functions for the Navy and other federal intelligence organizations. The 3,310-acre (13.4 km2) site was purchased by the Navy in 1941, and closed in 1993. The antennas continued to be used for some time after that, but by 2013 they were removed along with all of the remaining buildings.

Wingo is a ghost town located in Sonoma County, California in the United States. It can be found on older maps as a dot along the sloughs of Sonoma Creek, south of Sonoma and Schellville, and west of Buchli.

Rancho Suscol was an 84,000-acre (340 km2) Mexican land grant in present day Sonoma County, California, Napa County, California, and Solano County, California, given in 1843 by Governor Manuel Micheltorena to General Mariano Guadalupe Vallejo. In a significant land law decision, the land claim was rejected by the US Supreme Court in 1862. Rancho Suscol extended from Rancho Petaluma on the west, south down to the San Francisco Bay and Mare Island and Carquinez Strait, and then to Rancho Suisun on the east. It included present day cities of Vallejo and Benicia.

On October 25, 1991, a Bell 206 carrying rock music concert promoter Bill Graham, his girlfriend Melissa Gold, and pilot Steve Kahn crashed into a transmission tower west of Vallejo, California, killing everyone on board. The cause of the accident was determined to be the pilot's intentional flight into known adverse weather conditions.

Sonoma Creek is a 33.4-mile-long (53.8 km) stream in northern California. It is one of two principal drainages of southern Sonoma County, California, with headwaters rising in the rugged hills of Sugarloaf Ridge State Park and discharging to San Pablo Bay, the northern arm of San Francisco Bay. The watershed drained by Sonoma Creek is roughly equivalent to the wine region of Sonoma Valley, an area of about 170 square miles (440 km2). The State of California has designated the Sonoma Creek watershed as a “Critical Coastal Water Resource”. To the east of this generally rectangular watershed is the Napa River watershed, and to the west are the Petaluma River and Tolay Creek watersheds. This south flowing river drains the western slopes of the Mayacamas Range, the southern slopes of Annadel State Park and the eastern slopes of the Sonoma Mountains with intermittent winter flows in the higher tributary reaches. As the tributaries and headwaters reach the valley floor, a perennial stream cuts through scenic and valuable vineyards of Kenwood. Sonoma Creek veers west at Kenwood and cuts a gorge running parallel to Warm Springs Road, where it turns south to historic Glen Ellen, passing within one mile (1.6 kilometers) of Jack London State Historic Park and the Wolf House and thence southward paralleling Arnold Drive. In the city of Sonoma it is an urban creek which emerges into agricultural areas to the south. Finally, Sonoma Creek discharges to the vast Napa-Sonoma Marsh at the northern tip of San Pablo Bay. Principal tributaries to the creek include Yulupa Creek, Graham Creek, Calabazas Creek, Bear Creek, Schell Creek, and Fowler Creek.

Little Island is a partially submerged marsh island in the Napa Slough, branching off from the Napa River upstream of San Pablo Bay (an embayment of San Francisco Bay). It is almost entirely in Napa County, California, although part of its southern tip is in Solano County; it is managed as part of the Napa-Sonoma Marshes Wildlife Area. Its coordinates are 38°10′48″N 122°21′05″W, and the United States Geological Survey measured its elevation as 3 ft (0.91 m) in 1981.

Sonoma Valley Airport (FAA LID: 0Q3) is a public-use airstrip founded in 1946 by Wally Reichelt in Sonoma, California, United States. Its first California-certificated runway opened in August 1959. Located 4.14 nmi (7.67 km) south of central district of Sonoma (4.76 mi, 7.67 km) and 26.9 nmi (49.8 km) north of San Francisco (30.94 mi, 49.8 km), the airfield offers two asphalt runways, of which the 17/35 is restricted, needing prior permission to use. Open to public use for light aircraft, Sonoma Valley Airport does not allow ultralight and rotorcraft operations, except for MEDEVAC or law enforcement helicopters. There are no night operations. Flying hours begin at morning civil twilight and end at evening civil twilight. Fuel is self-serve. Among other fixed-wing aircraft, vintage planes can be seen on Sonoma Valley's apron, such as a fully restored, flying Curtiss P-40, a North American SNJ-4, three Boeing-Stearman PT-17 biplanes, a Globe Swift, a Cessna 195, a Douglas DC-3, a Dornier Do 27 or a Seabee amphibious. Others are being restored, like a Howard DGA-15. On the airfield are the Vintage Aircraft Company, air tour operator, and the North Bay Air Museum, a flying museum. Vintage Aircraft offers flights in restored WWII open cockpit Stearmans and AT6 Texan.

Arroyo Seco is a 6.9-mile-long (11.1 km) tributary stream to Schell Creek in southern Sonoma County, California, United States. In Spanish arroyo seco means "dry creek". Arroyo Seco Creek drains a portion of the western slopes of the southern Mayacamas Mountains. Its 11.4-square-mile (30 km2) watershed, along with the entire Mayacamas mountain block, was formed in the Miocene era by volcanic action and with tectonic uplift about 12 million years ago. Soils of the immediate streambed and its vicinity are classified as the riverwash series, recent deposition of sands and gravels.Arroyo Seco Creek springs near the Napa County line about 4 mi (6 km) northeast of Sonoma, California. It flows southward, emerging from near Sonoma Valley Hospital. After a confluence with Haraszthy Creek, it crosses under State Route 12 near Schellville, California, where it flows into Schell Creek. Schell Creek discharges to a network of sloughs that eventually empty into Sonoma Creek, which in turn empties into the Napa Sonoma Marsh and San Pablo Bay.

Schellville is an unincorporated community in Sonoma County, California, United States. Schellville was named after Theodore L. Schell, who lived on a ranch nearby. The community is located in the vicinity of the junction of California State Route 12 and California State Route 121 south of Sonoma, and had a post office from 1888 to 1931. Schellville also boasted a newspaper called the Schellville Ray, which was also used to promote local plots of land for sale.Schellville has been a regionally important rail junction since completion of the Santa Rosa and Carquinez Railroad to Napa Junction in 1888. The 2 mile long Northwestern Pacific Railroad railyard is located just south of the Schellville Depot at California State Routes 12/121 and Eighth Street East. Service along the mainline was planned to start again in July 2010, from the California Northern interchange at Schellville, north to Windsor until delays pushed the start date to 2011. The depot building, which was formerly a train station, now houses railroad equipment. Until it ended in 2014, Valley of the Moon Commute Club operated a once-daily transbay express service to San Francisco via Schellville, Sonoma, El Verano, Boyes Hot Springs, Santa Rosa, and San Rafael. Due to its low position along Sonoma Creek, the town regularly experiences flooding in high-rain years (about every 5–10 years).

Sears Point is a prominent landform that juts into the San Pablo Bay in Sonoma County, California, United States. This hill is the southernmost peak of the Sonoma Mountains and forms the southwestern ridge above Tolay Lake. Starting with European settlement of this area in the mid-19th century considerable modification of the Napa Sonoma Marsh began to occur, such that in contemporary times, there is considerable upland between Sears Point and San Pablo Bay. Numerous local conservation organizations are presently working to restore hundreds of acres of these historic tidal wetlands as part of the Sears Point Wetlands and Watershed Restoration Project. The region can be accessed via State Route 37 or State Route 121. Sears Point was named after Franklin Sears, who settled on 600 acres (2.4 km2) south of Sonoma in 1851. Later, he partnered with his father-in-law to purchase some 15,000 acres (61 km2), part of which is the present day racetrack, Sonoma Raceway.