From Innsbruck via A12 + Achensee-Bundesstrasse, approximately 30 km. Shore and boat fishing from Pertisau's central car park — subject to strict daily quotas and closed seasons.

Tyrol's largest lake (at 929 m elevation), approximately 6.8 km², 133 m deep, with crystal-clear mountain water. Home to the renowned Achensee arctic char (an endemic subspecies at risk of extinction) and lake trout.