Classic route through the heart of Alpine Lakes Wilderness in Washington, US. The route can be done either direction (CW or CCW). For the purposes of the FKT must go through Iron Cap peak. Once in the high country there are other routes to traverse between the valleys, but the Iron Cap one seems more popular (and also probably gains more elevation). Besides, you don't want to miss the views from the ridge.

There are two trailheads, one for each valley. You can start at either but must finish at the same to complete the loop.