For reference: Alaskaman Extreme triathlon is an ironman-distance triathlon. It is a 2.7-mile swim in Resurrection Bay in Seward, AK, 112-mile along the Seward Highway and a 27-mile run (with the last 7 miles to the top of Mt Aleskya). Ultraman Triathlon is a 3-day extreme triathlon. Day 1: 6.2-mile swim and 90-mile bike. Day 2: 170-mile bike. Day 3: 52.4-mile run.