You really will need your own transport to get to this walk. Leaving Sion, you drive along small country lanes heading up the hills to the Route Forestiere, then leave the car at a grassy car park. From then on the path is signposted. First, it follows a shady path upwards and then turns left to join the man-made canal, which burbles happily along the slopes. The first 30 mins is a gentle uphill stroll, following the path of the irrigation canal in wooded forests. You then come out to the Chapel Ste-Marguerite, and the path takes a sharp right turn and travels up the valley of the Forest de la Combe. The views from this path are quite spectacular, with a sheer drop down to the left of the wooden path, which is often suspended from the face of the mountain side. We only completed about 75% of the walk, but this was not particularly challenging for the able bodied. The biggest caution is that you need to devote enough time for the walk, as the first (less scenic) part will take at least 30 mins. There was a small cafe at the Chapel, but it was closed during the weekday that we were there. There are tables and chairs here, and I imagine it would be pleasant during the weekends.
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