Karlstad
Karlstad is built on the river delta where Sweden's longest river , Klarälven , runs into Sweden's largest lake , Vänern . 
<triplet> Klarälven <subj> Vänern <obj> mouth of the watercourse <triplet> Vänern <subj> Karlstad <obj> located in the administrative territorial entity <subj> Sweden <obj> basin country <subj> Klarälven <obj> inflows