Fideris has an area, (as of the 2004/09 survey) of 25.36 km² (9.79 sq mi).
 Of this area, about 58.7% is used for agricultural purposes, while 28.8% is forested.
  Of the rest of the land, 3.1% is settled (buildings or roads) and 9.4% is unproductive land.
 In the 2004/09 survey a total of 33 hectares (82 acres) or about 1.3% of the total area was covered with buildings.
 Of the agricultural land, 138 ha (340 acres) is fields and grasslands and 1,435 ha (3,550 acres) consists of alpine grazing areas.
 Since 1985 the amount of agricultural land has decreased by 65 ha (160 acres).
 Over the same time period the amount of forested land has increased by 65 ha (160 acres).
 Rivers and lakes cover 39 ha (96 acres) in the municipality.

Before 2017, the municipality was located in the Jenaz sub-district of the Prättigau/Davos district, after 2017 it was part of the Prättigau/Davos Region.
 It is a cross shaped linear village which lies on the Prättigau-Schanfigg route.
 It consists of the village of Fideris which is made up of the sections of Strahlegg and Fideris-Au.

In 1994, devotees of the Skanda Vale spiritual community in Wales bought a chalet near Fideris, and in 2016 this was inaugurated as a temple in its own right, now called Somaskanda Ashram.
This temple draws pilgrims and devotees from across Europe.
Fideris has an area, (as of the 2004/09 survey) of 25.36 km² (9.79 sq mi).  Of this area, about 58.7% is used for agricultural purposes, while 28.8% is forested.   Of the rest of the land, 3.1% is settled (buildings or roads) and 9.4% is unproductive land.  In the 2004/09 survey a total of 33 hectares (82 acres) or about 1.3% of the total area was covered with buildings.  Of the agricultural land, 138 ha (340 acres) is fields and grasslands and 1,435 ha (3,550 acres) consists of alpine grazing areas.  Since 1985 the amount of agricultural land has decreased by 65 ha (160 acres).  Over the same time period the amount of forested land has increased by 65 ha (160 acres).  Rivers and lakes cover 39 ha (96 acres) in the municipality.
Before 2017, the municipality was located in the Jenaz sub-district of the Prättigau/Davos district, after 2017 it was part of the Prättigau/Davos Region.  It is a cross shaped linear village which lies on the Prättigau-Schanfigg route.  It consists of the village of Fideris which is made up of the sections of Strahlegg and Fideris-Au.
In 1994, devotees of the Skanda Vale spiritual community in Wales bought a chalet near Fideris, and in 2016 this was inaugurated as a temple in its own right, now called Somaskanda Ashram. This temple draws pilgrims and devotees from across Europe.
Fideris