Full Distance Triathlon Wales in Pembrokeshire Swim: Athletes begin with a two-loop, 2.4-mile (3.8 km) swim starting at Tenby's iconic North Beach. The course features a unique Australian exit, where participants briefly leave the water between loops before re-entering. The average water temperature is 63°F (17°C). Bike: The 112-mile (180.2 km) bike course consists of two hilly loops through the scenic Pembrokeshire Coast National Park. Cyclists will pass by numerous castles and iconic ...