The Tjulån runs between the lakes of Tjulträsk and Gautsträskthe, close to the Ammarnås locality, in the region of Västerbotten in the north of Sweden. Present fish species are grayling, trout and some canadian char. This latter
is the remaining of some exemplars that were introduced several years ago. Also if some Ammarnås lake trout are also caught every now and then,
the grayling is the undisputed Tjulån highlight.