The Wallersee is the largest lake in the Salzburg Lake District. It covers an area of six square kilometres.

The lake does not get ist name from the fish found there, „Wallern“ or catfish, as many believe, but from the central-german word „Walchen“ which means „stranger“. For the locals, anything south of Bavaria, including the alpine peoples who had mingled with the Romans, were „Walche“.

Wenger Moor – National Protected Area

A larger part of the area between Köstendorf and the Wallersee comes under the National Trust, including the Wenger Moor. The reeds on the banks of the lake are full of protected animals and birds such as grey herons, peewits, curlews, ducks, pheasants, great crested grebes, coots, jays, swans and black-headed gulls. The lake is the home of a variety of fish, for example catfish, bream, pike, carp, eels and tench.