The Lac d'Ilay (or Lac de la Motte) is a lake in the Jura department of France. It has a surface area of 0.72 km² (180 acres). It is located in the communes of Le Frasnois and La Chaux-du-Dombief.Les 4 lacs (Ilay, Narlay, Petit et Grand Maclu), www.jura-tourism.com
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