Corsier is a municipality of the Canton of Geneva, Switzerland. Corsier is first mentioned in 1297 as Corsiacum. Between 1816 and 1858 Corsiā¦Corsier is a municipality of the Canton of Geneva, Switzerland. Corsier is first mentioned in 1297 as Corsiacum. Between 1816 and 1858 Corsier and Anières formed a single municipality. Corsier has an area, as of 2012, of 2.74 square kilometers. Of this area, 1.58 km² or 57.7% is used for agricultural purposes, while 0.08 km² or 2.9% is forested. Of the rest of the land, 1.1 km² or 40.1% is settled, 0.03 km² or 1.1% is either rivers or lakes and 0.01 km² or 0.4% is unproductive land.