US Highway 89 traverses two, quite different segments within the Basin and Range region of the United States. The first part begins at its southern terminus at Nogales and snakes north through the cactus-filled Sonoran Desert, up over juniper-studded lava flows and eventually to the colorful red rocks near Sedona. The stretch between Yarnell and Sedona is technically within a region called (in Arizona), the Transition Zone. This interesting landscape incorporates features from both the Basin and Range and the Colorado Plateau and that is why it is considered transitional between the two. However, in this narrative we will consider the Transition Zone as part of the Basin and Range since it looks more like it than the Plateau. US Highway 89 enters its second segment of the Basin and Range as it spills out of Spanish Fork Canyon near Provo, Utah. The highway skirts Utah Lake and the Great Salt Lake on it’s way to Brigham City, where it turns east towards Logan and enters the Rocky Mountains.