With a surface area of 5.45 km2, it is one of the largest natural lakes of France. Small towns as Novalaise, Lepin-Le-Lac, St. Alban de Montbel and Aiguebelette-le-lac are located along the lake. The lake is bordered by the Chaîne de l'Épine ridge to the east, with its high point at Mont Grelle (1,425 metres (4,675 ft)). The ridge is crossed by various hiking trails, and paragliders launch regularly from the Col de l'Épine during the summer. The lake distinguishes itself by its blue-green color. The lake is extraordinary by the 7 hot water wells that make the temperature of the water pleasant in summertime. There are also some camping sites along the lake and privately owned waterhouses. There are games organised for different camp sites to compete and the usual fireworks in summertime to celebrate the beginning of the French summer break. In the south of the lake there are two islands, Le Grand Ile and Le Petit Ile. A chapel has been built on the big island and archaeologists found prehistoric materials there. The deepest point in the lake is 71 meters. Motorboats are not allowed on the lake to preserve the silence and wildlife along the lake. There are breathtaking views of the lake from the church at St. Alban de Montbel, mountain ridges and the higher located countryside, a bit north of the road around the lake.