Before the merger, Riein had a total area of . Of this area, 21.9% is used for agricultural purposes, while 37.2% is forested. Of the rest of the land, 0.9% is settled (buildings or roads) and the remainder (39.9%) is non-productive (rivers, glaciers or mountains). The former municipality is located in the Ilanz sub-district of the Surselva district. It is located at the entrance to the
Lumnezia on a terrace east of the
Glenner. It consists of the
haufendorf village (an irregular, unplanned and quite closely packed village, built around a central square) of Riein and the
hamlet of Signina, which joined Riein in 1904-05. Signina is separated from Reien by the Val da Riein. ==Demographics==