The Chalk Hill AVA is a sub-appellation of the Russian River Valley located near the town of Windsor along the foothills at the southern end of Alexander Valley and along the Santa Rosa plain. The name Chalk Hill comes from the unique volcanic soil of chalky white ash which has shown itself to perform well with planting of white wine varietals like Chardonnay and Sauvignon blanc. The majority of the region's wineries are located on the western slopes of the Mayacamas Mountains.