Dully is a municipality in the district of Nyon in the canton of Vaud in Switzerland. Dully is first mentioned in 1238 as Delui. Dully has an ar…Dully is a municipality in the district of Nyon in the canton of Vaud in Switzerland. Dully is first mentioned in 1238 as Delui. Dully has an area, as of 2009, of 1.7 square kilometers. Of this area, 0.88 km² or 53.0% is used for agricultural purposes, while 0.25 km² or 15.1% is forested. Of the rest of the land, 0.48 km² or 28.9% is settled.