Hermance is a municipality of the Canton of Geneva, Switzerland.
Hermance is first mentioned in 1247 as intra Armentia. In 1271 it was mentioned as Eremencia.
Hermance has an area, as of 2009, of 1.44 square kilometers (0.56 sq mi). Of this area, 0.83 km2 (0.32 sq mi) or 57.6% is used for agricultural purposes, while 0.19 km2 (0.073 sq mi) or 13.2% is forested. Of the rest of the land, 0.42 km2 (0.16 sq mi) or 29.2% is settled (buildings or roads), 0.02 km2 (4.9 acres) or 1.4% is either rivers or lakes.
Of the built up area, housing and buildings made up 22.2% and transportation infrastructure made up 3.5%. Power and water infrastructure as well as other special developed areas made up 1.4% of the area while parks, green belts and sports fields made up 1.4%. Out of the forested land, 10.4% of the total land area is heavily forested and 2.8% is covered with orchards or small clusters of trees. Of the agricultural land, 36.8% is used for growing crops and 5.6% is pastures, while 15.3% is used for orchards or vine crops. Of the water in the municipality, 0.7% is in lakes and 0.7% is in rivers and streams.
The Hermance is a river that rises in France in Haute-Savoie, between Machilly and Loisin, and flows for 7 kilometres through the small valley from Hermance and the commune of Veigy-Foncenex where it marks the Swiss-French border on the last 6 kilometres of its course by bordering the communes of Anières and Hermance in Switzerland and Chens-sur-Léman in France, before flowing into Lake Geneva.
Flood control and other river maintenance issues are regulated under the 1959 Hermance River Agreement.
Coordinates: 46°18′N 6°14′E / 46.300°N 6.233°E / 46.300; 6.233
[Instrumental]