The smallest of the six bathing lakes in the west of Kufstein is called Lake Pfrillsee and represents a popular hiking destination.
Lake Pfrillsee, with its 1,8 hectares the smallest of the six lakes in the west of Kufstein, does not have an overground inlet. It is fed by subterraneous springs and its runoff is the Pfrillbach river, which joins the Inn river. On the southern lakeside, the lake is impunded for about one metre in order to prevent it from diminishing in size.
However, this lake is a popular destination for hikers, not least because from the southern lakeside you can enjoy a beautiful view on Kufstein and its tributary valleys. Beside Lake Hechtsee, Lake Längsee and Lake Egelsee Lake Pfrillsee belongs to the so called "Thierberg Lakes", which are considered to be tectonic phenomenons. These lakes represent basins that the Inntal Glacier has cleared out in the last Ice Age. Today Lake Pfrillsee is in private hands, but is accessible for free.
About 100 m from Lake Pfrillsee there is a reeds pond, which used to be called "Lake Haarsee". This little pond has probably been separated by a rockfall. In the surroundings of the lake, crossed vipers turn up from time to time, as it is a poisonous serpent native of Austria.
Altitude: 612 m a.s.l.
Surface: 1.8 hectares
Maximum depth: 8 m