Many thanks to Cicerone reader David Anderson who pointed out that the GR20 had been diverted slightly at Lac du Ninu. I went to have a look in September.
GR20 - A Pleasant Interlude at Lac du Ninu by Paddy Dillon
Many thanks to Cicerone reader David Anderson who pointed out that the GR20 had been diverted slightly at Lac du Ninu, between the Hotel Castel di Vergio and the Bergeries de Vaccaghja. I went to have a look in September and found a notice saying that the southern shore of the lake, where the route used to run, is now a 'protected zone'. Most trekkers were happy to follow the newly-marked route, despite it being a little longer, but some die-hards were sticking to the old route. In my opinion, the view from the northern shore is better than that from the southern shore. While it's true that the old route includes a water source, the new route runs very close to the Bergeries des Inzecche, where for the sake of a five-minute detour, drinks and snacks are available.
This walk can be found in my guidebook to the GR20: Corsica.
The High Level Route
Guidebook to walking the GR20 through Corsica's high mountains. A challenging trail between Calenzana and Conca that includes hands-on scrambling, the 190km trek can be completed by fit walkers in about two weeks. The guidebook includes high and low-level alternatives, plus extra mountain climbs, and all you need to know for this tough route.