HexaTrek is a 3034 km hiking trail, connecting 14 of the most beautiful nationals parks and crossing France from the Vosges to the Pyrenees.
The path follows the highest mountain regions of our country, often nicknamed “l’Hexagone” for its hexagonal shape, joining together some of the most emblematic summits, natural wonders and wildest places.47 Great Hiking GR® trails have been brought together in a single path to create this thru hike.
en.hexatrek.com

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2022 is the first year of the thru hike. But they already have an app.
Wild camping in France is technically illegal. But you are allowed to … Bivvy. Tent only in the dark in certain areas.