The lake is considered a 'karst lake,' meaning its water source is primarily subterranean spring systems.
The surrounding rock faces are part of the Northern Limestone Alps, composed mainly of Dachstein limestone.
The lake is privately owned by the mining company VA Erzberg, which manages the surrounding forest and land.
The color of the water is famously emerald-green to deep blue due to the high mineral content and lack of suspended sediment.
It is a popular location for 'Seerundgang' hiking, a flat, family-friendly trail spanning roughly 3 kilometers.
Leopoldsteinersee is a crystal-clear mountain lake situated at the foot of the Hochwald and Seemauer mountains in the Styrian Eisenerz Alps. The water is fed by karst springs, maintaining a low temperature year-round even during summer months. A well-maintained loop trail encircles the entire lake, providing views of the surrounding limestone cliffs. The lake occupies a rock basin carved by glaciers during the last ice age. It serves as a starting point for alpine mountaineering routes, including the ascent toward the Hochblaser peak. The lake is private property but remains accessible to the public for walking and recreational use. The depth of the lake reaches approximately 31 meters at its deepest point.
The eastern bank of the lake, looking westward toward the reflection of the Hochblaser mountain in the water.
Bring sturdy footwear, as parts of the trail can be damp or covered in loose gravel.
Visit during the early morning hours to observe the lake when the water surface is most reflective and calm.
Bring a windbreaker, as the deep valley location can cause rapid temperature drops even in mid-summer.
Attempting to swim in the lake or launching unauthorized watercraft, which are strictly prohibited by the owners.
No swimming or watercraft are permitted in the lake to protect the sensitive aquatic ecosystem.
