 It is noted for its blue-green colour and the seven hot water springs.The communities of Novalaise, Lépin-le-Lac, Saint-Alban-de-Montbel and Aiguebelette-le-Lac border west side of the lake, whilst the Chaîne de l'Épine ridge lies to the east with its high point at Mont Grêle ().At the southern end there are two islands, "La Petite Ile" and "La Grande Ile" which has a chapel.