- "Situated north of Raton Canyon, there's no better place to lose yourself than the Chiliad Mountain State Wilderness. More people go missing here than anywhere else in San Andreas."
- — GTA V digital manual
Gravel roads and dirt trails criss-cross the region. one of these roads leads to a tunnel cutting through the heart of the mountain. Strangely, while the road at each end of the tunnel is rough and rural, the road within the tunnel is paved, well-lit and highway grade.
The State park is known for its wildlife and Hunting which Trevor Philips can participate in with Cletus Ewing who is a pro hunter in the mission Fair Game and thereafter as a solo pastime. The park is also the location of the mission The Last One which is unlocked after 100% Completion of the game. The mission is famous as it involves tracking down, and killing bigfoot. Below is a list of known wildlife that inhabits the park.
Cougars are considered very dangerous and may attack the protagonist without warning, often resulting in a "one-hit kill" (although activating Trevor's special ability can avoid this). (Some walkthroughs suggest coyotes were at one point also equally dangerous, but in the current updates they're timid and run away.) It is particularly hazardous to wander the area on foot at night; the animals will not attack someone in a vehicle. If playing as someone other than Trevor (or even if playing as Trevor), if exploring or engaging in activities such as collection challenges, it's advised that the character be armed at all times when not in a vehicle.
It is based on the real life San Gorgonio Wilderness.