It really is worth the just under 15 minute drive from Annecy. If you prefer to wander about in nature, rather than in shops, then this attraction is worth it. We spent a great 2 and a half hours here. Do note that there are quite a few steps to climb if you use the first parking lot. It seemed like the second parking lot had a more gradually sloped walkway, for those who aren't comfortable with stairs. We saw some people struggling with the latter. The gorge is truly beautiful and the amount of workmen and hours that must have gone into the construction of the walkways, roughly 24metres above the water, is awe-inspiring. Take time to read the signboards halfway along the walkway, so that you can appreciate the surprise on the way back. Also, have look in the little room on your way out, as they have spectacular footage of how high the water occasionally rises to completely cover the walk bridge. Before leaving up the many steps, we wandered in the opposite direction, along the tarred road, past the picnic tables and veered off into the woods on a few pathways, eventually reaching a beautiful stretch of river as it runs into the gorge.
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