The lakes at the various put in and take out points are receiving heavy camping use (Twelvemile Slough, Portage Lake, Nelson Walker Lake, Pingo Lake and Lake Matcharak). Vegetation around the lakes is being destroyed and the impact is detracting from the area's wild character. After arriving move directly to the river to camp. Camp on river gravel bars. Use existing trails between lakes and the river. Do not build fires on the tundra.