The water surface in the fish ponds is at an altitude of 51.2 m above sea level, and the plateau adjacent to the ponds is at 99.6 m above sea level. This is almost a 50 m difference in levels. Erosion processes have carved out a spring cirque with a diameter of over 50 m from the slopes of the moraine. Its walls are cliffs 20 m high. The bottom of the cirque is lined with smaller and larger pebbles and stones, from between which water seeps everywhere, connecting dozens of small streams into one main stream - one of the source streams of the Płonia River. The gravel pit at the bottom of the spring cirque is the substrate for an alder forest of the spring alder type. Source: debno.treespot.pl/166-debno-zrodla-ploni
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