The Coles Bay Triathlon is held within the natural reserves of beautiful Coles Bay, on the east coast of Tasmania, Australia. Learn more about Coles Bay here. The most exciting triathlon of the year, held in arguably the most scenic surrounding in Australia. A 1.9 km swim, 90 km ride and 21.1 km run (Half), 375/10/2.5 (Enticer) and 500/20/5 (Sprint), with the most spectacular natural back drop you will ever experience. Coles Bay is situated at the northern edge of the Freycinet National Park.