The Great Jura Crossing on foot is a long-distance hiking trail (GR) that winds through the Jura Mountains, from Mandeure, near Montbéliard (in the north), to Culoz in the Ain region (in the south). The GTJ fully crosses the Haut-Jura Regional Nature Park and offers a detour into neighboring Switzerland. Inaugurated in 2004, the GTJ on foot follows the GR GTJ long-distance trails and sometimes the GR 5 and GR 9.
The full GTJ hike takes 15 to 20 days. Since my vacation time isn’t unlimited, I opted for a 10-day trek from Pont-de-Roide to Bellegarde-sur-Valserine, covering nearly 320 kilometers (so about 60 kilometers short) with 10,000 meters of elevation gain—and just as much descent. The route is classic, except for the must-do variant via the Colomby de Gex (Balcon du Léman).
Accommodations include mountain huts, step lodges, and guest rooms with tables loaded with Morbier cheese gratin, Morteau sausages, rösti, and michons... Oh, and I almost forgot: I’m hiking solo...
http://lerandonneurfou.blogspot.fr/2014/05/la-grande-traversee-du-jura-gtj.html
