The Mt. Umunhum Ultras in San Jose, CA combine nature and the trials of endurance.
This 52-mile race, with over 15,000 feet of elevation gain, will test even the most seasoned runners.
The course winds through forests, meadows, and along steep climbs through the Santa Clara Valley, Sierra Azul Open Space Preserve, and Santa Cruz Mountains.
A more manageable challenge is available through the 50K race, though it also includes climbs and descents.