Jasseron is located 8 km north-east of Bourg-en-Bresse, at the junction of the road from Bourg-en-Bresse Saint-Claude. This town is located to 2 / 3 plain, 1 / 3 in the Revermont, first folds of the Jura. Residents as tourists like to enjoy the forest Tessonge, covering nearly half of the plain, and the Mount Cuchet, Mont Curtet, Les Combes.
According to legend Jasseron, the treasure of ancient nobility would have been hidden in a cave at the foot of the castle dungeon. During Christmas Eve at 1 stroke of midnight, the subway would open for a glimpse of the treasure, and would close in the 12th stroke of midnight. One woman went so Jasseron, Christmas night, the castle with her child in order to load gold. At 1 stroke of midnight, the subway opened. She then put her child in the basement and began to take gold. But when the 12th time, she had no time to recover her child. She waited until the next Christmas, promising to build a chapel to the Virgin if she recovered. She then returned to the castle and the first stroke of midnight the child was there. As promised she built a chapel is the chapel of Notre-Dame-des Conches.