Rapa River Delta, Sweden By Kaushik Monday, September 09, 2013 Europe, National Parks, Travel 3 comments The Rapa River (also called Rapaätno) flows through the Sarek National Park, winding through magnificent mountain ranges and narrow valleys, in north Norrland, in Norrbotten County, Sweden. A tributary of the Lesser Lule River, Rapa stretches 75 km from its source up i..