Rissajaure, also called Trollsjön and sometimes Kärkevaggepadajaure, (Northern Sami: Rissájávri) is a lake in the Kärkevagge valley in Kiruna Municipality, Sweden. It is the clearest and purest lake in Sweden and has a visual depth of 34 m, right down to the bottom. It is located about 120 km from Kiruna. It is composed of meltwater from the surrounding glaciers.