Exit 18 on A7 Montélimar Sud direction Viviers then St Montan - D262
Cross this beautiful medieval village and follow a small road that goes up towards Larnas.
Pass in front of the Larnas tourist office and take the direction of Gras for 4.5 km still on the D262
At the first intersection turn left D462 direction Rimouren then immediately left you have arrived.
Approximately 30 minutes from the motorway exitLeave the national road and head towards Bourg St Andéol then St Remèze on the D4. After 11 km turn right towards Gras D462. Pass the village of Rimouren, continue for 3 km, the farmhouse De Dumas is on the right.