Oldflån-Flån is a large, unexploited area in north-western Sweden near the Norwegian border, holding very high ornithological values and a valuable mosaic of wetlands and forests, with wetland types representative of the EU Alpine biogeographic region including string fens, string mixed mires, topogenous fens, sloping fens and swamp forest. The Site has been extended by over 400 hectares, with the inclusion of large mire areas in the nature reserve in the east and realignment of the boundary in the south-west in line with the Swedish Mire Protection Plan. On the plateau, the Oldflån area is composed of a variety of mire complexes, including soligenous fens, marsh forests and a highly valued string mixed mire which is rich in cloudberry Rubus chamaemorus. In the valley, the Flån area contains small lakes and solid ground “islets”, as well as a complex of topogenous soft ground fens, mixed mosaic mires, string flark fens with flark pools and marsh forests. The wet mires and the virgin forests support rich fauna, especially a large number of waders including nationally threatened species such as the ruff Philomachus pugnax and the European herring gull Larus argentatus. Like many parts of northern Sweden, the area is used for reindeer husbandry by the local Sami population. The main factors affecting its ecological character relate to logging and wood harvesting.