Rivaz is a municipality in the canton of Vaud in Switzerland, located in the district of Lavaux-Oron. Rivaz is first mentioned in 1138 as Ripa. Riv…Rivaz is a municipality in the canton of Vaud in Switzerland, located in the district of Lavaux-Oron. Rivaz is first mentioned in 1138 as Ripa. Rivaz has an area, as of 2009, of 0.31 square kilometres. Of this area, 0.21 km² or 67.7% is used for agricultural purposes, while 0 km² or 0.0% is forested. Of the rest of the land, 0.07 km² or 22.6% is settled, 0.02 km² or 6.5% is either rivers or lakes.