The Sourdough Triathlon is a half-Ironman distance race held in Chatanika, AK about 45 minutes northeast of Fairbanks at Milepost 31.5 of the Steese Highway. It's a quiet area with minimal traffic and plenty of wide open spaces. The swim is in a former gravel pit filled by a pristine groundwater stream. The bike course is two laps on a quiet, paved two-lane road with the occasional vehicle passing through. The run course is two laps on the shoulder of this same road. Due to the course layout, this event is very spectator-friendly, many competitors and their families camp out at the site the night before the race in RVs or tents.