The ground is next to the Gendarmarie,( which is well signposted in the town) and is surrounded by a concrete wall.
Allow an hour from Mussidan, head south for Bergerac and then to Eymet. As you come down a hill before Eymet take a left to Issigeac, and then immediately right to the Gendarmarie. The ground is on your left after 500m, surrounded by a concrete wall. If you see the GEndarmarie you have gone to far.