Mount Chiliad is Grand Theft Auto V's tallest mountain and a hotspot for conspiracies. Including sightings of Bigfoot and the presence of a UFO, many conspiracies are surrounding the mountain. It is likely that the mountain is based on Mount San Jacinto because of its appearance and similarities.

Mount Josiah and Mount Gordo are the two other named mountains in Grand Theft Auto V. It is also possible that Mount Chiliad is based on Mount San Antonio or Mount San Gorgonio.