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Waters in Bory Tucholskie

Surface waters in Bory Tucholskie are one of the most important features of the local landscape, along with the relief and beautiful green areas. While speaking about those waters, we can indicate numerous lakes and rivers. All those watercourses, according to the sloping of the terrain, flow on the left bank of the Vistula River to the Vistula’s ice-marginal valley. They are flowing on the courses of former melt waters. Due to the significant sloping of the sander, all rivers are characterized with a sharp drop, such as rivers flowing in the mountain areas. The most important rivers in Bory Tucholskie are Brda and Wrda, also referred to as the Dark Water. Brda and Wrda rivers are the main hydrographic axes in Bory Tucholskie.
Their characteristic features are:
– Balanced flow and height of the water during the whole hydrographic year
– High quality of waters, comparing them to those of the Polish Depression
– High density of natural flora and watercourses near the basin
– Usage of the waters mainly for agricultural purposes (fields watering with the network of ameliorative channels – Brda and Wrda’s Grand Channels)
– Good transit features for kayak tourism
– Sharp drops and well-shaped valleys, going about 10 meters deep inside the sander
Bory Tucholskie is the area full of natural watercourses. Lakes, mainly of gutter type, create extensive water networks, connected with the same basin. Lakes located on the Zbrzyca and Wrda tracks are the great example of this geographical phenomenon. All natural watercourses located on the area of Bory Tucholskie were created during the recession of the last glacier. The most widespread are gutter type lakes, which were created as a result of postglacial waters’ influence. Those lakes are long and narrow.
There are many in-cave lakes located on the area of the sander, which were created by melting of separated pieces of ice. Such lakes are characteristic due to their low, yet varying depth, as well as irregular and visibly shaped line of the banks and advanced declining processes occurring there. Examples of such lakes are Kruszyńskie and Somińskie lakes.
There are also moraine lakes on the area of Bory Tucholskie, which can be frequently observed in the form of rounded troughs (Wielewskie Lake for example). They were created in depressions created by irregular accumulation of glaciers.
There are also lobelia lakes on the area of the park, which are characterized by high purity of waters and specific flora surrounding them, which is almost impossible to find around other lakes.

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