Dino Domain

Dino Domain is the first world of Diddy Kong Racing and Diddy Kong Racing DS and an area of Timber's Island. Racers are required to have at least one Golden Balloon to enter. Dino Domain is set in a dry, prehistoric area with dinosaurs and pterodactyls. Most of the courses are in a canyon landscape, which features small lakes and some plant life, specifically grass and pine trees. One of the stages is set in an entirely volcanic region, along with its Challenge Level. Tricky the Triceratops is the boss of Dino Domain.

The world's hub is located to the right of Wizpig's rock-carved head on Timber Island. To enter Dino Domain, the racer drives up a small bridge leading into a tunnel carved in a hill. A large door to the hub is located at the end. A rainbow is positioned just outside the tunnel, likely resulting from the waterfalls on each side. The Challenge Door is located on the right side, with a small pond just outside it.

Like its subsequent worlds, Dino Domain has a Trophy Race that the player can enter after they win against Tricky again. Also like the other worlds, T.T. walks around the center of Dino Domain's hub, and the player can bump into him to review their game progress.