The southern portion of SR 271 begins at an interchange with US 101 in the community of Cummings.
Junction, Mendocino County, California, also called Glenblair Junction, a former settlement located 3.25 miles southwest of Glenblair by rail
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The Alexander Valley covers a broad expanse of land east of the Russian River consisting of the watershed that runs southeast from the Mendocino County line down to the boundaries of the Chalk Hill AVA.
The Guidiville Rancheria of California are a Pomo tribe located in Mendocino County, California.
The Hopland Band of Pomo Indians of the Hopland Rancheria is a federally recognized tribe of Pomo people in Mendocino County, California, south of Ukiah.
The Pinoleville Pomo Nation is a federally recognized tribe of Pomo people in Mendocino County, California.
The Potter Valley Tribe is a federally recognized tribe of Pomo people in Mendocino County, California.
Juveniles have been found as far upstream as 12 km, e.g. in Ten Mile River, Mendocino County, and San Antonio Creek and the Santa Ynez River, Santa Barbara County, sometimes in sections of stream impounded by California Golden beavers (Castor canadensis subauratus) which provide ideal slow-moving water habitat for tidewater gobies.
Limnanthes bakeri, the Baker's meadowfoam, a rare plant species endemic to Mendocino County, California
Underwood Park, California, an unincorporated community in Mendocino County, California