An Ironman Triathlon is the hardest one-day endurance race in the entire world. Tallinn is one of the few capitals in Europe to host a full-length IRONMAN event.
The race begins with a single-loop 3,8 km swim in the Baltic Sea near the Seaplane Harbour museum. Athletes will then continue onto a two-loop, 180.2 km bike course along the coastline and nearby villages. The final 42.2 km four-loop run takes participants through the historical city center of Tallinn, an UNESCO world heritage site, and finishes on Freedom Square (Vabaduse väljak).