Boulder Canyon

Boulder Canyon is a large, Aztec pyramid area in Frogger's dimension. Legend states that a sacred object, replaced every two years by something even more sacred, sits on a shrine in the canyon; those who steal said item never make it out alive. When Swampy kidnapped the baby frogs, some were thrown into Boulder Canyon, forcing Lillie Frog to venture through and rescue them—outrunning the gigantic boulder that chased her out after she rescued that which was placed on the shrine ("Frogger 2: Swampy's Revenge").

In the "Dimension" saga, the purple chaos emerald is not only teleported here, but chosen as the new sacred object as well, which worries the group after Frogger explains what that entails. Nevertheless, the group initiates its search for the emerald, during which Swampy makes his presence known by snatching Tad and Cheese, causing the group to engage in combat with him; Sonic, Tails, and Shadow, finding this brawl counter-productive, decide to continue seeking out the emerald, only to discover the presence of Metal Sonic, who has brutally assaulted Zim, GIR, and Minimoose. As another battle ensues, Sonic and Tails eventually locate the emerald atop the shrine described in the legend, which Sonic momentarily forgets about as he collects the emerald, triggering the release of the gigantic boulder that nearly crushes everyone in its path; Frogger manages to guide the alliance out of the area, while the boulder rams into Swampy and Metal Sonic, sending them both plummeting into the depths of the canyon itself (though later managing to regroup with Doctor Eggman elsewhere).