Jenins is a municipality in the Landquart Region in the Swiss canton of Graubünden. Jenins is first mentioned in 1139 as Uienennes. In 114…Jenins is a municipality in the Landquart Region in the Swiss canton of Graubünden. Jenins is first mentioned in 1139 as Uienennes. In 1142 it was mentioned as Gininnes. Jenins has an area, as of 2006, of 10.5 km². Of this area, 48% is used for agricultural purposes, while 40.1% is forested. Of the rest of the land, 3.6% is settled and the remainder is non-productive.