Reisadalen is one of the most idyllic river valleys in Norway; from Storslett in Nordreisa the valley stretches south-southeast, covered with birch, pine, grey alder, and willow. The northern part of the valley is wide, with high mountains on both sides; the southern part of the valley narrows to a few hundred metres (canyon), with increasingly dry climate. The valley floor is fairly flat with little height difference for (to Bilto); the Reisa river can be navigated by canoe or river boat for much of this distance. The salmon swim up the river, and some 137 different species of birds have been observed. Several rivers cascade down into the valley; the "Mollisfossen" waterfall is . The valley ends southeast of Storslett, as the vast and more barren Finnmarksvidda plateau takes over. Reisa National Park protects the upper part of the valley.