A nature reserve in Jämtland County, Sweden. It is part of the pan-European Natura 2000 network. The nature reserve is a diverse landscape with mountain peaks, forests and wetlands.

The Sonfjället National Park is a lot more inaccessible and therefore considerably quieter. This mountain (fjället) is known to be one of the best places to see bears in Sweden without them being lured with food. Sonfjället is also located in Dalarna but receives far fewer visitors to Fulufjället because it is smaller and there are hardly any tourist facilities.