I live in France, and I can tell you that it's inreasingly difficult to find offroad tracks that are legal to ride on. Unfortunately, no map will tell you that, it's only at the start of the trail that you'll find a sign that says "forbidden" (or not). And it's different every year, we come back and find out a mayor has plastered the area with "entrance forbidden to motor vehicles" signs.
In addition, some forrests (forêts domaniales) are forbidden to all vehicles.
Plus there are restricitons in Souther France during the summer months due to fire hazards.
FYI, the usual fine for trespassing is 135€.
That's the reason those travel companies can sell offroad tours, finding nice and legal trails is very difficult and time-consuming.
Laurent
PS: Mongolia is just 8000 km away, so why not make a little detour ?
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