The Holualoa Tucson Half Marathon course — officially titled the Damascus Bakeries Half Marathon — starts on Biosphere Road, just a short drive from the Biosphere 2 research facility. From there, runners head onto Highway 77 and follow it south for the next 9 miles until they reach the turn onto East Golden Ranch Drive. After that, runners a nearly square loop before crossing the finish line at the Golder Ranch Fire Station.
(MORE: Holualoa Tucson Marathon & Half Marathon event details)