Radon Springs in Lopukhinka, Natural monument in Leningrad Oblast, Russia

Radon Springs in Lopukhinka is a protected natural site where two artificial lakes with turquoise water sit in a valley-like formation near the Lopukhinka River. The valley drops to depths around 30 meters and creates a sheltered landscape bordered by broad forests.

In the 1830s, explorer Bellingshausen and physician Pirogov built a water treatment facility here for sailors who came to use the mineral-rich springs. This early use for healing established the place as a treatment center.

The broadleaf forests here feature elm, ash, and linden trees that are typical of this region and rarely found together elsewhere. Walking through these woods, you notice how they frame the water and create a special woodland character.

The protected area covers about 159 hectares and visitors can explore the forests and lakeshores, though collecting samples or organizing programs needs prior approval from local authorities. Allow time for walking trails through the wooded areas along the water.

The water here becomes mineral-rich from colorless radon gas that rises from very ancient rock layers deep underground. This natural enrichment comes from limestone and sandstone formations that date back hundreds of millions of years.