An area on the right-bank fluvial plain of the Otava River, east of the  town in the cadastral territory of Hajská, which was significantly changed by the gold mining activity of humans during the Middle Ages. The system of smaller pools with valuable wetland and aqueous vegetation (most significantly the water violet) and many kinds of amphibians was declared a specifically protected area in 1985 (natural monument, 6.50 hectares). There are continuously executed revitalization works that include removal of mud from the grounded pools and foundation of new pools. These heaps (deposits after gold mining) with characteristic growth of heather are a protected archaeological locality.