HALF DISTANCE TRIATHLON BAHRAIN offers a fast course with a unique highlight—a bike segment that includes part of the Bahrain International Circuit race track. Swim (1.9 km / 1.2 miles) – A one-loop course in front of Reef Island, following an "L"-shaped layout in 73°F (23°C) water. Bike (90 km / 56.1 miles) – A single-lap route passing the World Trade Centre and the Bahrain International Circuit before returning to Reef Island. Run (21.1 km / 13.1 miles) – A four-loop course from Reef ...