Half IRONMAN 70.3 Knokke-Heist, Belgium! The Ironman 70.3 Knokke-Heist course promises to be a challenging and rewarding experience for athletes of all skill levels. Let's dive into the details of the course, starting with the swim segment. Swimmers will begin the race with a 1.9 km swim in the North Sea, right off the stunning Knokke-Heist Beach. The cool and refreshing water temperature will provide a refreshing start to the race, but be prepared for some choppy waves and strong currents. ...