Grono is a municipality in the Moesa Region in the Italian speaking part of the Swiss canton of Grisons. On 1 January 2017 the former municipalities of Leggia and Verdabbio merged into the municipality of Grono.HistoryGronoGrono is first mentioned in 1219 as de Grono. In 1395 it was mentioned as de Agrono.LeggiaLeggia is first mentioned in 1295 as de Legia.VerdabbioVerdabbio is first mentioned in 1203 as Vertabio.GeographyAfter the 2017 merger Grono had an area of. Before the merger Grono had an area, (as of the 2004/09 survey) of 14.83km2. Of this area, about 8.6% is used for agricultural purposes, while 58.4% is forested. Of the rest of the land, 4.5% is settled (buildings or roads) and 28.5% is unproductive land. In the 2004/09 survey a total of 44ha or about 3.0% of the total area was covered with buildings, an increase of 11ha over the 1983 amount.Of the agricultural land, 4ha is used for orchards and vineyards, 68ha is fields and grasslands and 69ha consists of alpine grazing areas. Since 1983 the amount of agricultural land has decreased by 12ha. Over the same time period the amount of forested land has increased by 25ha. Rivers and lakes cover 32ha in the municipality.Before 2017, the municipality was located in the Roveredo sub-district of the Moesa district, after 2017 it was part of the Moesa Region. The village is on the right bank of the Moesa river by the mouth of the Calanca.