Greng is a municipality in the district of See/Lac in the canton of Fribourg in Switzerland. Greng is first mentioned in 1349 as Groyn. Greng ha…Greng is a municipality in the district of See/Lac in the canton of Fribourg in Switzerland. Greng is first mentioned in 1349 as Groyn. Greng has an area, as of 2009, of 1 square kilometer. Of this area, 0.74 km² or 76.3% is used for agricultural purposes, while 0.1 km² or 10.3% is forested. Of the rest of the land, 0.14 km² or 14.4% is settled and 0.03 km² or 3.1% is unproductive land.