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The Blue Ridge Berryessa Natural Area is a conservation area forming a contiguous corridor of 800,000 acres (3,200 km2) in northern California. It is a mix of public and private lands overseen by the Blue Ridge Berryessa Natural Area Conservation Partnership. The Partnership was founded in 1997 as a forum for land managers to discuss land use activities, primarily Homestake Mining Company surplus acreage at McLaughlin mine. The meetings evolved into a regional conservation focus and effort. The Partnership has more than 100 participants, among them are: Yolo Land & Cattle Co., Homestake Mining Company, Guenoc Ranch and Winery, Bureau of Land Management, Gamble Ranch, and the University of California Natural Reserve System. The purpose of the Blue Ridge Berryessa Natural Area is preservation of recreational lands, wild areas, agricultural lands and rural ranches. Also, protection against urban sprawl through conservation easements, public ownership and voluntary participation by private landowners and businesses. The natural area is named for two prominent geographic features it encompasses: the Blue Ridge Mountains and Lake Berryessa. It includes the watersheds of Cache Creek and Putah Creek, tributaries to the Sacramento River. The geographical boundaries are informal and conceptual. It begins just north of Interstate 80 near Fairfield, California, then northeast to Lake County.