Theory: Dinosaur Land's Location

Abstract
Dinosaur Land, from Super Mario World, as well as Yoshi's Island, explored in Super Mario World 2: Yoshi's Island and other subsequent Yoshi's Island games are located within the Cascade Kingdom, seemingly along the 'neck bones' of the skull-shaped continent

Arguments

 * Argument 1: Along with other factors, Dinosaur Land and Cascade Kingdom are both known to primarily feature a populace of Dinosaurs (Odyssey Brochure).


 * Argument 2: The Cascade Kingdom is reasonably close to the Mushroom Continent, which would enable nearby travel, and would appear suitable as a 'vacation spot' as it was in the initial premise of Super Mario World.


 * Argument 3: There is a similarly shaped landmass of islands in the Cascade Kingdom, seen in the attachment.