Thunder Hollow is the demolition derby venue where Cruz Ramirez competes in Pixar's Cars 3.
Lightning McQueen and Cruz travel to Thunder Hollow while searching for unconventional training methods. The location hosts a rough-and-comedic demolition derby featuring vehicles with very different styles from the sleek professional racers on the Piston Cup circuit.
Cruz enters the event and discovers that her simulator-trained skills can work in a chaotic real-world competition. The sequence gives her an opportunity to show courage and quick thinking while also deepening the partnership between her and McQueen.
Radiator Springs is the town central to the first Cars film, while Willy's Butte is a racing location connected with McQueen's training in Cars 3. Neither is the demolition derby arena. Thunder Hollow is specifically the venue named for the event in the third feature.