Aliso and Wood Canyons Regional Park is a major regional park and wildlife sanctuary in Orange County in the U.S. state of California, covering approximately 3,879 acres (6.02 square miles or 15.7 km²) in the lower watershed of Aliso Creek. It borders the suburban districts of Aliso Viejo, Dana Point, and Laguna Niguel, and the small city of Laguna Beach. The park encompasses the main Aliso Canyon, a water gap through the San Joaquin Hills; Wood Canyon, a major tributary valley; and portions of Laguna Canyon, Hobo Canyon, and the El Toro Cliffs. Located at the southern end of the Monterey Formation, it is a major archaeological site that has yielded both artifacts of native inhabitation and ancient marine fossils dating back to the middle to late Miocene age.