From the Super Mario Wiki
Rocking Range is the third of five continents explored in Wario Land: Shake It! Its environment is very barren, possibly in reference to the American southwest, with a railway running through its expansive desert, where a Las Vegas-like neon-lit city featuring casinos, circuses and fountains can also be found. It also features cave and mining environments. While Queen Merelda was captured, Chortlebot ruled Rocking Range.