The Simi Hills are a mountain range located in California, primarily within Ventura County. They stretch approximately 20 miles and are known for their scenic beauty, featuring rolling hills, canyons, and diverse wildlife. The area is popular for outdoor activities such as hiking, biking, and horseback riding. The hills are part of the larger Santa Monica Mountains region and are characterized by a Mediterranean climate. The terrain includes various ecosystems, including chaparral and oak woodlands. The Simi Valley, situated to the north, is a prominent urban area that provides access to the natural landscapes of the Simi Hills.