This pond with an area of 120 hectares has a special function. It is used as a retention tank for salty mine waters escaping from shafts – these waters are also pumped from considerable depths. It is a special group of groundwater, which is heavily mineralised in the carbonic layers. The Heřmanice pond and its surroundings are also an important ornithological locality, there are special types of birds like Western marsh harrier, Northern lapwing or Common redshank. The special character of this place is enhanced by fishing "bungalows" on the surface.