The Site includes the delta of the River Tufsinga where it meets Lake Femund, and a section of the Lake. The landscape is in a state of slow continuous change as the river erodes, transports and deposits sediments to create a number of small islands covered with mires and willow scrubs, and belts of sedge. The formation of mires into the lake through the overgrowing of ponds is considered to be remarkable. Land areas along the slow flowing river are dominated by large, dry and open mires with several dystrophic pools and ponds. The aquatic vegetation is relatively rich and the river banks are surrounded by dense birch woodland.  Despite the Site’s high altitude and latitude, a total of 49 different wetland bird species have been recorded. Several nationally threatened bird species use the Site for feeding, breeding and staging, probably because of the great variety of biotopes in the area. Human uses include sport fishing, berry-picking, hunting and canoeing, but human impacts are very limited. The Site is valuable for its roles in flood reduction, sediment trapping and nutrient fixing.