Wildsee, Natural monument lake in Seefeld in Tirol, Austria.

Wildsee is a mountain lake in Seefeld in Tirol surrounded by forests and reed beds along its shores. The water body features distinct zones around its perimeter that create varied landscapes for visitors to explore.

The lake was historically linked to fishing activities and influenced the naming of the nearby settlement. Later it gained importance as a protected natural area dedicated to environmental conservation.

The lake probably gave the village of Seefeld, first recorded in 1022, its name. Emperor Maximilian I kept fish here and had lampreys introduced, so the lake was also called Lampretensee; the breeding lasted only a few decades. Today two beaches serve bathers.

The lake lies at the foot of the Gschwandtkopf; the Haglbach enters at the southeast and the Seebach leaves to the north. Two beaches serve bathers, and the south shore borders the Reither Moor nature reserve. Visibility in the bog-coloured water is only 1 to 3 metres, so the shallow edges are the easiest place to watch the bottom.

Emperor Maximilian I had lampreys introduced into the lake for fish farming, which earned it the name Lampretensee. The breeding of these prized food fish lasted only a few decades. The lake was declared a natural monument in 1926.