Yes, saguaro only grows wild in the Sonoran Dessert in southern Arizona. That still covers a lot of territory. But to be identified by a cute name . . . it must be near a road or trail, perhaps somewhere in a National Park. There is a Saguaro National Park full of cacti, but it's split into 2 sections with Tucson in the non-Park middle. So I must guess. Rincon District of the National Park, about 12 miles east of Tucson.

Did you know people have been killed by Saguaro Cacti? If they fall on you . . . they grab you with their arms and then suck the blood out of your veins.