Lac de Charmes, Artificial lake near Bannes, France

Lac de Charmes is a 197-hectare reservoir created in the late 19th century, 8 km north of Langres. It is fed by the Val de Gris stream and bordered by the communes of Charmes, Changey, Bannes and Neuilly-l'Évêque. Its dam is noted as remarkable, and a white sign at the roadside reads "RÉSERVOIR DES CHARMES" above a fish silhouette.

Lac de Charmes was created in the late 19th century as one of four reservoirs feeding the upper reach of the Canal entre Champagne et Bourgogne. Its construction submerged a village. The reservoir is managed by Voies navigables de France and its dam is noted as remarkable.

The water attracts many bird species and serves as a popular spot for nature watching. Visitors often come here to observe wildlife and spend time by the water's edge.

The D 121 runs along the entire northern shore, while the D 54 and D 74 cross the lake; a walking path circles the water, alternating woodland trails, footbridges and the dam. A supervised beach operates in high season, and pedal boats, canoes, rowing boats and fishing boats can be rented. The former Langres–Andilly railway line along the southern shore is disused.

The European pond turtle was recorded at the lake's tail, the shallow upper end, and is protected in France under the Bern Convention. The reservoir also holds four dragonfly species rare in the region, out of fifteen recorded there.