The official address to the start/finish line is:
Feriendorf 1, CH-3984 Fiesch, VS, Schweiz
If you plan to drive from the airport to the race start, we recommend landing in Zürich. The drive is incredibly scenic especially driving along the Vierwaldstättersee, through Göschen and Andermatt, over the Furkapass, down the valley towards the race starting line. Parking at the sport resort is for free.
If you plan to take the train then the resort has its own train station "Feriendorf - Fiesch" and you arrive, literally, right at the race start/finish location.