GPS N 45,6914 E 5,7385
Just after driving through the "Chat Tunnel" "Cat tunnel", keep on D1504 road toward Saint Jean de Chevelu and Yenne up to the main round about. It indicates 4 exits. The first one on the right hand leads to Culoz. The second one, goes to Belley. Take the third one on the left leading to Yenne city centre. After about 200 metres take the second street on your right. Round the corner on your left there is "The Office du Tourisme de Yenne”. Turn slowly around the church and drive still facing a right of way. Turn right and straight again few hundred metres. On the left hand side the Fire Station. Carry on. When reaching the crossroad, take the road in front of you. Slight bend and go along the cemetery on your left. From there keep driving about 1.5 miles on the sinuous road. A CSSN sign hangs on a tree branch. From there, half mile roughly bumpy road leads to the site main gate.