Los Guillicos Preserve

The William Hood House was built in 1858 by William Hood. Its California Historical Landmark number is 692. It was listed on the National Register of Historic Places on February 6, 1998.The house was built from bricks that were made on the property. An adobe building, a vineyard and a winery were built with the house, none of which remain. The Knights of Pythias bought the house in 1924, after several different owners including United States Senator mining magnate, railroad and newspaper owner Thomas Kearns. The Los Guilicos School for Girls purchased the land in 1943. A sign posted in November 2008 states that, after restoration, the house would be opened to the public.

Rancho Los Guilicos was a 18,834-acre (76.22 km2) Mexican land grant in present-day Sonoma County, California given in 1837 by Governor Juan B. Alvarado to John (Juan) Wilson. The grant extended along Sonoma Creek, south of Santa Rosa from Santa Rosa Creek south to almost Glen Ellen, and encompassed present day Oakmont, Kenwood and Annadel State Park.

Mount Hood, also known as Hood Mountain is a mountain near the southeastern edge of Santa Rosa, California at the northeast of the Sonoma Valley and attains a height of 2,733 feet (833 m). The original name was Mount Wilikos, an Indian name meaning "willows." Most of the drainage from Mount Hood contributes to the headwaters of Sonoma Creek. A prominent feature is the extensive rock face visible on the upper half of the mountain as viewed from State Route 12. The habitats on the mountain include mixed oak forest, pygmy forest, chaparral and riparian zones. In prehistoric times the slopes of Mount Hood were inhabited by a division of the Yuki tribe. Most of Mount Hood is within the Hood Mountain Regional Park maintained by Sonoma County. Mount Hood is part of the inner coast Mayacamas Range, and lies mostly within Sonoma County, with a part of the mountain geographically within Napa County. Mount Hood affords overlooks of the Pacific Ocean, San Francisco Bay and "a spectacular view east to the Sierra Nevada Range."

Kenwood is an unincorporated community and census-designated place (CDP) in Sonoma County, California, located on Sonoma Highway (State Route 12) between the cities of Santa Rosa and Sonoma. It lies east of Sonoma Creek in the upper part of Sonoma Valley, a region sometimes called the Valley of the Moon. Bennett Mountain lies west of the town, and Sugarloaf Ridge to the northeast. The population was 1,028 at the 2010 census. Kenwood is considered part of the Wine Country. Viticulturally, it lies in the Sonoma Valley AVA. The Kenwood area is known for vineyards and wineries, restaurants, and a European-style resort. An area landmark is the Kunde Estate Winery on Sonoma Highway, which was first planted in 1879.

Kenwood Depot was a railway station in Kenwood, California. It opened in 1887 as South Los Guilicos, and shares some features with the San Carlos station on the San Francisco Peninsula which was built around the same time. The station building was the only stone depot constructed for the Santa Rosa and Carquinez Railroad and cost $11,500 (equivalent to $374,559 in 2022) — tracks were on the east side. The station's name was changed to Kenwood in 1895 with the rest of the town. Rail service continued until 1936, and the rail line was removed in 1942. In 1940, Southern Pacific sold the depot to the Kenwood Improvement Club for $500 (equivalent to $10,444 in 2022) and it was converted into a community center. It was designated a Sonoma County Historic Landmark in 1980.

Bear Creek is a 2.8-mile-long (4.5 km) stream in eastern Sonoma County, California, United States, a tributary of Sonoma Creek.

Ledson Marsh is a 30-acre (0.1 km2) freshwater marsh in Annadel State Park east of Santa Rosa in Sonoma County, California, United States. Located on the east flank of Bennett Mountain, it drains into Schultz Creek, a tributary of Yulupa Creek.

Trione-Annadel State Park is a state park of California in the United States. It is situated at the northern edge of Sonoma Valley and is adjacent to Spring Lake Regional Park in Santa Rosa. It offers many recreational activities within its 5,092-acre (2,061 ha) property. The rock formations of Trione-Annadel have played a central role in its history: its volcanic origins, the Native American use of obsidian, the early 1900s mining of cobblestones, and modern hikers' appreciation of its volcanic rock outcrops. These lands were occupied by the Wappo and Pomo people in prehistoric times, who would have primarily inhabited the riparian zones and the marsh perimeter. Annadel includes what some biologists consider the best example of undisturbed northern oak woodlands in existence. Visitors can enjoy the park's diverse wildlife and scenery during any time of the year but are perhaps most rewarded from April through June when most wildflowers are in bloom. The park has gone through two Wildfires in its history, the 2017 Nuns fire that burned the majority of the park and the most recent Glass fire in 2020.

Bennett Mountain, also commonly known as Bennett Peak, is a 1,909-foot (582 m) summit in the Sonoma Mountains of California. Located on the west edge of Annadel State Park, it separates Bennett Valley in the Russian River drainage basin from Sonoma Valley in the Sonoma Creek drainage basin.Bennett Valley was named for James N. Bennett, an emigrant from Illinois who settled in the area in the 19th century.The mountain was burned following the October 2017 Northern California wildfires.

Lake Ilsanjo is a man-made lake located in Annadel State Park east of Santa Rosa in Sonoma County, California, United States. It is a place for fishing and swimming, especially in the summer months. Entrepreneur Joe Coney originally owned the land that is now Annadel State Park and named the lake after his wife Ilsa and himself. Thus it came to be called Lake Ilsanjo. It drains into Spring Creek. The lake is formed by a dam constructed in the 1950s. Originally the overflow drained to a gully during the winter months, but in 2003, the state spent almost $400,000 building a spillway and release valve to reduce downstream erosion. During the winter of 2007–08, park officials accidentally left the release valve open, causing the lake level to drop far below normal, exposing mudflats that would normally be underwater.

Yulupa Creek is a 2.8-mile-long (4.5 km) southeast-flowing perennial stream that rises on the southeastern flanks of the northern Sonoma Mountains in Sonoma County, California, United States. This creek, which drains the eastern slopes of Bennett Mountain, is tributary to Sonoma Creek, which in turn discharges to San Pablo Bay. Yulupa Avenue in Santa Rosa is presumably named after this creek.

Bennett Valley is a northwest- to southeast-trending valley in Sonoma County, California, US, approximately 1 mile (1.6 km) wide in its northwestern portion, where the southeast extremity of Santa Rosa, California is located. The axis of the valley floor slopes 40 feet (12 m) per mile (a gradient of 0.008 or 7.6 m per km) from the pinched central portion of the valley, where knolls divide the northwestern from the southeastern segment of the valley. Bennett Valley is drained by Matanzas Creek which is incised into the valley floor; an unnamed stream and Spring Creek drain into Matanzas Creek from the east side of Bennett Valley below the Matanzas Creek Reservoir. A flood-control reservoir on Matanzas Creek in the central portion of the valley collects water from the drainage of the upper portion of the valley. Precipitation in the valley varies from approximately 35 to 40 inches (90 to 100 cm) per year. The latter amount falls on Taylor Mountain, located immediately above Bennett Valley, in an outlier spur of the Sonoma Mountains sometimes called the Los Gullicos Range. Rainfall occurs primarily during winters (November to April), separated by warm dry summers. Bennett Valley is accessed chiefly via Bennett Valley Road, which traverses the valley floor to connect southeast Santa Rosa with Warm Springs Road in Glen Ellen.