About

Ko Chang 100 is a demanding ultra-trail challenge set in the wild landscapes of Mu Ko Chang National Park, where runners take on dense jungle paths, rocky ground, and steep, punishing climbs. The course is known for its brutality, turning the island’s lush tropical scenery into a true test of endurance and resolve. Despite the tough terrain, the event pairs adventure with strong on-course support, including medical care and welcoming local hospitality that add reassurance to the experience. The result is an intense but memorable journey through one of Thailand’s most dramatic island settings, with a focus on both resilience and runner safety.