This 20-kilometre nature trail runs across magnificent pine forests to the shores of the Siiponjoki river. There is a kota hut and two lean-tos by the river. The river snakes through the sandy terrain, constantly reshaping its bed and creating a magical atmosphere and the occasional lush riverbank grove in the otherwise open woodland landscape. Downstream, the river forms a number of distributaries that flow into the sea at the Rahja archipelago. The nature trail offers some of the best scenery in Kalajoki.