Siviriez is a municipality in the district of Glâne in the canton of Fribourg in Switzerland. Siviriez is first mentioned in 1147 as Sivrie. Siviriez has …Siviriez is a municipality in the district of Glâne in the canton of Fribourg in Switzerland. Siviriez is first mentioned in 1147 as Sivrie. Siviriez has an area, as of 2009, of 20.3 square kilometers. Of this area, 15.1 km² or 74.5% is used for agricultural purposes, while 3.48 km² or 17.2% is forested. Of the rest of the land, 1.62 km² or 8.0% is settled, 0.04 km² or 0.2% is either rivers or lakes and 0.05 km² or 0.2% is unproductive land.