In 2006, Greenbelt Alliance, the Bay Area's land conservation and urban planning organization, published the newest edition of its landmark study on the state of the region's landscapes. The report found that if current development patterns continue, roughly one out of every 10 acres in the entire Bay Area could be paved over in the next thirty years. Today, there are 401,500 acres of greenbelt lands at risk of sprawl development. That includes 125,200 acres at risk within the next 10 years, classified as high-risk land, and 276,200 acres at risk within the next 10 to 30 years, classified as medium-risk land. Around the region, the places at highest risk -- the sprawl hot spots -- include the I-80 corridor in Solano County, the eastern cities in Contra Costa County, Coyote Valley in southern Santa Clara County, the Tri-Valley area of Alameda and Contra Costa Counties, and areas along Highway 101 through Sonoma County.