The site of Brion lies :

5,5 km from the Gironde

8 km from Lesparre

50 km from Bordeaux

The site is situated at the far end of the Marsh of Reysson, on a partly wooded piece of land, slightly higher than the surrounding countryside . It is about 600 metres west of the hamlet of Brion. You can reach the site by starting from Saint Germain d'Esteuil and following either of the routes indicated on the map.

When conducted tours are available they start from the south entrance