Columnar cacti, renewable energy, and squirrels I. Map boundaries: 30 to 35 degrees North; 110 to 117 degrees West II. Country (State): Mexico (Baja California, Sonora), United States (Arizona, California). III. Overview This entry focuses on the Sonoran Desert north of 30 degrees latitude and the Chihuahuan Desert west of 110 degrees longitude. The … More Sonoran Desert and Sky Islands, Part I