The Pyhä-Nattanen Circle Trail runs from Sompiojärventie through Sompio Strict Nature Reserve to the rocky Pyhä-Nattanen fell. It is a compact but wild-feeling hike, with open fell views and a taste of the quieter country beyond Tankavaara's gold-mining sights. Stay on the marked route: strict nature reserves in Finland are managed more tightly than ordinary national parks.