Howell Mountains

Twin Sisters are the twin summits of the highest peak in the Howell Mountains of Solano and Napa Counties, California.

Wild Horse Creek is a small principal stream located in the Vaca Mountains within northern Solano County, California. It flows from Lake Madigan and Lake Frey, and joins with Green Valley Creek.

Wild Horse Valley is an American Viticultural Area (AVA) that straddles between Napa and Solano Counties, California and partly resides within the larger Napa Valley AVA. The wine appellation was established as the nation's 102nd, the state's 58th, and both counties' fifth AVA on November 30, 1988 by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury after reviewing the petition submitted by John Newmeyer of Napa and four other interested persons proposing the viticultural area named "Wild Horse Valley." The appellation encompasses a valley landform near the city of Napa that extends approximately five-and-a-third-mile (9 km) long and one-and-two-thirds-mile (3 km) across at its widest point. The petition states Wild Horse Valley's total acreage is 3,300 acres (5 sq mi) with 73 acres (30 ha) of cultivation in the viticultural area. Its southerly location results in more hours of sunshine than other locations in Napa Valley and the adjacent Solano County Green Valley. The proximity to San Pablo Bay results in a cooler climate, making Wild Horse Valley attractive for the cultivation of grapes like Pinot noir. The Wild Horse Valley viticultural area is within the North Coast viticultural area. Wild Horse Valley partially overlaps the Napa Valley and Solano County Green Valley viticultural areas. The Suisun Valley viticultural area is approximately 2.5 miles (4 km) east of the Wild Horse Valley separated only by the Solano County Green Valley.

Green Valley is a census-designated place (CDP) located in Solano County, California, United States. It sits in the northeast corner of the San Francisco Bay Area and is located approximately 45 miles (72 km) from Sacramento, approximately 38 miles (61 km) from San Francisco, approximately 32 miles (51 km) from Oakland, less than 15 miles (24 km) from Napa Valley, and less than 15 miles (24 km) from both the Carquinez Bridge and the Benicia Bridge. The use of "Green Valley" as a place name predates the CDP designation by over a century; a Green Valley Township appears on an 1890 map of Solano County.The population was 1,654 at the 2020 census.

Palmaz Vineyards is a Californian winery in the Napa Valley, primarily dedicated to Cabernet Sauvignon production. The estate is located on what was once the Cedar Knoll Vineyard Company, a pre prohibition winery, founded in 1881 by Henry Hagen, one of the pioneers of wine production in the Napa Valley. After prohibition the winery fell into a dilapidated state and the winery was abandoned. The Hagen House and the vineyards have since been restored after they were bought by Amalia and Julio Palmaz in 1997. The family operated winery and vineyards cultivate some 55 acres using sustainable farming practices, devote to Cabernet Sauvignon, Chardonnay, Riesling, Muscat along with smaller plantings of Merlot, Malbec, Cabernet Franc and Petite Verdot.Palmaz Vineyards is noted for having the largest wine cave in the Napa Valley, totaling 100,000 square feet. Palmaz Vineyards' winemaking and aging takes place within the living rock of Mount George, in a multi-leveled series of tunnels and domes. The height of the wine cave is equivalent to an 18-storey building, providing the vertical range needed for true gravity-flow winemaking. Thus, the wine is not subjected to the violent agitation of pumping, which can change the wine's intra-molecular structure. This gentle treatment allows finer nuances of flavor to develop naturally. The fermentation dome is the world's largest underground reinforced structure. It is 72’ in diameter and 54’ high. Temperature stays constant at 60 degrees and humidity at 75%, the perfect atmosphere for aging wine. The cave houses its own water treatment plant built to comply with strict conservation guidelines. References

The Suisun Valley AVA is an American Viticultural Area in Solano County, California, located just east of the Napa Valley wine region in the Coast Range. It was established as a wine appellation on 27 December 1982, making it among the first AVAs of California (eighteenth overall), Napa Valley being the first.

Coombsville is an American Viticultural Area (AVA) located within Napa County, California just east of the city of Napa. The 11,075-acre (17 sq mi) wine appellation was established as the nation's 200th, the state's 123rd and the county's eighteenth AVA on December 13, 2011 by the Alcohol and Tobacco Tax and Trade Bureau (TTB), Treasury after reviewing the petition submitted by Thomas Farella of Farella-Park Vineyards and Bradford Kitson, on behalf of the vintners and grape growers in the Coombsville region of Napa Valley, proposing the viticultural area named "Coombsville." The appellation is nestled in the southeastern region of the Napa Valley viticultural area, between the eastern shores of both the Napa River and Milliken Creek and the western ridgeline of the Vaca Range at the Solano County line. Proximity to San Pablo Bay contributes to the temperate climate of Coombsville where the cool marine air and fog occurs almost daily during the growing season, arriving early and linger longer in the southern region of Napa Valley. Temperatures are also less extreme during the winter frost season. The Coombsville soils are dominated by the volcanic, rhyolitic tuff sedimentary rock and lava flows of the Vaca Range on the eastern side of the Napa Valley. Coombsville lies upon wide alluvial deposits created by the weathering of the hillsides and its soils contain abundant rock, gravel and, in some areas, layered with volcanic ash deposits from Mount George. The area is the sixteenth sub-appellation designated within the 252,541-acre (395 sq mi) Napa Valley viticultural area. Its USDA plant hardiness zone is 9b.

The Solano County Green Valley AVA is an American Viticultural Area located in Solano County, California. Located southeast of the Napa Valley AVA, Green Valley is about 1 mile (1.6 km) wide and 4 miles (6.4 km) long. The valley is close to San Pablo Bay and thus has a maritime climate. Most of the vineyards are planted on the valley floor and benefit from moist, cooling winds in the summer afternoons.

Mankas Corner is an unincorporated community in the Suisun Valley AVA, is an American Viticulture Area in Solano County, California.

Patwino Worrtla Kodoi Dihi Open Space Park is a 1500-acre (~600 hectare, ~6 square kilometer) regional park in the city of Fairfield, Solano County, California, United States. The name means "Southern Rock Home of the Patwin People" in the Patwin language. The park is administered by the Solano Land Trust in partnership with the Yocha Dehe Wintun Nation. Opened in 2024, the park features 14 miles of trails, and includes ADA-compliant trails and bathrooms.

Rockville Hills Regional Park is a 633-acre (~256 hectare, 2.56 square kilometer) regional park in the city of Fairfield, Solano County, California, United States. The park is known for its volcanic rocks, thin topsoil, grasses, and blue oak trees. There are also oak woodlands, grassland savannas, chaparral and some aquatic habitats.

An outgrowth of local camp meetings, Rockville Stone Chapel was constructed in the fall of 1856, in use by Christmas of that year, and dedicated in February 1857. Divisions in the congregation over slavery soon split the congregation, with the Northern faction splitting off at Christmas Eve 1863 to form their own church. Attendance at the chapel slowly declined, with the last resident pastor leaving in 1895. Although services continued sporadically, the building fell into disrepair and, in 1929, the chapel was donated to the County of Solano. With the onset of the Great Depression that year, restoration did not occur for another decade, with the WPA finally accomplishing a full renovation in the spring of 1940. Declared a State Historical Landmark in October 1962, the chapel continues in use today (2019), serving as the sanctuary for the local Church of Christ congregation and also hosting weddings and funerals.