The Rapa River flows through the Sarek National Park in north Norrland, in Norrbotten County, Sweden.
The Rapa valley is the artery of Sarek. It is a splendid piece of unspoiled wilderness with dense thickets of mountain birch, osier and herbaceous plants. The flora is poor in most of the park, but the animal life in the valleys is rich. The Rapa delta is considered to be the most beautiful river delta in Scandinavia.