ABOUT THE BAYOU CITY TRIATHLON SERIES - Unique venues, high quality production, the best finishers medals in town…Onurmark triathlons are second to none in the Houston area. As some of the largest multi-sport events in the country Onurmark triathlons have become destination events for athletes, pro and amateur, from all over the world. Onurmark also produces multi-sport events for children of all ages and skill levels through the Youth Triathlon Academy. Click any event below to be taken to learn more about the great multi-sport events Onurmark produces and register today!