15 minutes from the A71 motorway or 25 minutes from the A85 motorway, come on the road to the ponds or the road to Bièvre located between La Ferté Beauharnais and Marcilly-en Gault. Arrived at the place called Boisquillon, it is the portal n°698 by taking the communal way on 30 meters.
It's the brown portal.