Aliso Canyon is a massive gap through the south-central part of the San Joaquin Hills. The San Joaquin Hills are a small coastal mountain range in Orange County, about long and wide. The Aliso Canyon is about long measured from where it begins near Laguna Niguel Regional Park to its outlet at Laguna Beach. About deep on average and wide at its widest extent, it is one of the largest gaps through the San Joaquin Hills. Others include the Laguna Canyon and the San Juan Creek canyon.