Jasseron is located 8 km north-east of Bourg-en-Bresse, at the crossroads of the road from Bourg-en-Bresse to Saint-Claude. This commune is located for 2/3 in the plain, and 1/3 in Revermont, the first folds of the Jura. Residents and tourists alike like to enjoy the Tessonge forest, covering almost half of the plain, as well as the Mont Cuchet, Mont Curtet and Les Combes.
According to the legend of Jasseron, the treasure of the ancient lords would have been hidden in an underground at the foot of the keep of the castle. During Christmas night, at the stroke of midnight, the underground would open to reveal the treasure, and would close again at the stroke of midnight. A woman from Jasseron therefore went to the castle on Christmas night with her child in order to load herself with gold. At the stroke of midnight, the underground opened. She then deposited her child in the underground and began to take the gold. But at the time of the 12th blow, she did not have time to retrieve her child. She waited for the next Christmas, promising to build a chapel to the Virgin if she got it back. So she returned to the castle and at the stroke of midnight her child was there. As promised she built a chapel; it is the chapel of Notre-Dame-des-Conches.
