IRONMAN 70.3 Knokke-Heist, Belgium - The swim course takes place in the refreshing North Sea waters, where athletes will dive into the ocean and embark on a 1.2-mile (1.9 km) swim. The cool waters and mild currents make for an enjoyable and energizing swim that will get your heart pumping. After completing the swim, athletes will transition to the bike course, which winds its way through the scenic Flanders region. The 56-mile (90 km) bike course will challenge athletes with rolling hills and ...