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Lac d'Ilay, also called Lac de la Motte, is a lake in the Jura department of France, about 14 km south of Champagnole in Franche-Comté. It lies at an altitude of 774 m in the municipalities of Le Frasnois and La Chaux-du-Dombief and covers an area of approximately 0.7 km². The lake is 1.9 km long, has a maximum width of 400 m, and has a small island (Île de la Motte). Its greatest depth is 32 m.

On most maps it is called "Lac d’Ilay". The other name probably comes from the small island "Île de la Motte" which is located in the lake.

The monks of Saint-Claude are credited with establishing a monastery in the 6th century to the southwest of the Abbey Lake on the island known as sur la Motte. Then, probably having fallen into disuse for several centuries, a second monastery succeeded it in the 12th century (1172) built to the northeast of the lake on the current site of the hamlet of l'Abbaye by the canons of the Abbey of Abondance (Augustinians of Haute-Savoie). The status of abbey, served by a particular abbot, remained for a century, until the monastery was the subject of an exchange of goods between the abbot of Abondance and that of Saint-Claude. Once again dependent on the Abbey of Saint-Claude, the Abbey of Grandvaux regained the status of priory. From the fortified buildings of the 12th century, which were accessed by a drawbridge, there remains today an old farm building (called La Joséphine after the former owner of the place), a presbytery and a church, dedicated to Notre-Dame de la Nativité, like that of Abondance. The site has been listed since September 15, 1966. A site to discover through a stroll in 4 scenes, evoking the history of the site.

Very nice on the way back along the south of the lake

The tour of the lakes is not of much interest, mainly being wide paths, without much relief, and with no view worthy of the name, including on the lakes (which we see very little, except on the eastern part, which is a shame). The western part is even difficult (we follow the road for 2km...). In short, a walk to forget, except perhaps for a running outing, or a detour via the Eagle peak.

It is a natural lake of glacial origin with a wild appearance. This lake will surprise you with its turquoise shores on a clear day and its cliffs in the background. It is otherwise known as Lake Ilay. With an area of 72 hectares and an average depth of ten meters, it is fed mainly by Lake Grand Maclu, to which it is connected by a small natural canal approximately 200 meters long. Possible activities: Hiking (tour of the three lakes/four lakes) and mountain biking (tour of the five lakes), horse riding, holiday activities and entertainment... Swimming is tolerated, under your own responsibility.

Lake L'Abbaye in the Jura Mountains is surrounded by hills and forests. Its clear waters reflect the landscape, offering a peaceful setting for boating, fishing, and hiking. Unfortunately, swimming is not permitted.

This lake is one of the lesser known in the Jura, but it has its place, with stunning views all year round and the abbey which is its jewel.