France
Widely considered the toughest trek in Europe the GR20 follows the spine of the Corsican mountains from the north west to south east of the island. The trek, mountains and views are spectacular. The hut infrastructure is good and the people are very friendly.
Some people go out and do as much as they can of the route in a week. It can be completed in less than 2 weeks but give yourself 1 week more and you can take the 'alpine variations' and a few side trips. Treat yourself to some time in Corsica at the end of trek to enjoy beaches, good food and powerful cheese.
I few hours hike up the stunning Gorges de Tavignano from Corte will bring you to this remote refuge at 1166m altitude, where there are dorms or shady camping spots by the river.
The refuge has basic catering facilities, and most importantly, a stock of cold Corsica Cola or Pietra beer after a hot morning's hike. A very peaceful site with little to disturb you except the occasional clanging of a cowbell or the yapping of the refuge's resident puppies.
It's a perfect spot to chill out for the day, lazing on riverside rocks and taking a dip in the mountain stream, before continuing towards the Lac de Nino and onto the GR20, or back towards Corte down a parallel valley.
Gorgeous.
Trains stop at the railway station in Corte. Pick up the trail behind the citadel, at the bottom of rue col-Feracci. Follow the orange paint flashes marking the long distance Mare a Mare Nord footpath.
Wild river swimming - excellent fast flowing river in beautiful valley, with deep pools and stony beaches at the side.
www.corsica.co.uk/Docs/About-Corsica/Central-Corsica/Things-To-See-And-Do.aspx
Nearest village is a steep 2 hour walk away - Olmi Cappella, but you can drive down a windy road to the Tartagine valley floor.
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