Wieluń Upland - a physical and geographic mesoregion located in southern Poland. It extends in between Many and Częstochowa. It covers an area of 1443 km². It is situated at an altitude of 220 to 280 m above sea level. The highest peaks are about 300 m above sea level. (Miętna - 303.8 m above sea level and Dębowa Góra - 284.6 m above sea level). The land in the northern part Kraków-Częstochowa Upland, within administrative boundaries Wieluń County and spider voivodeship of Lodz and of the Kłobuck poviat of the Silesian Voivodeship and is part of the Upper Jurassic Plate. It is made primarily of Upper Jurassic limestones (containing fossils of the rich fauna of the Jurassic seas), as well as Middle Jurassic and Upper Triassic rocks. Jurassic rocks subject to karstization are covered with a thin layer of glacial deposits, formed during the glacial period of the Central Polish Guard Stadium. The rocks of the substrate only in places reveal themselves from under the Quaternary sediments. The highest peaks are moraine hills and kemes. Characteristic for this area, as well as for all areas built of carbonate rocks, are karst forms, manifested here in the form of funnels and fissures in the ground.
The upland is crossed by river valleys, including the Warta valley three times, as well as the Liswarta and its tributaries: Czarna Oksza, Biała Oksza and many smaller watercourses.
The main feature of the landscape is the valley Worth itwhich, after reaching the area of the region, changes its direction to the latitudinal one, to suddenly turn north in the vicinity of Załęcze. The Warta River creates three gorges here: Działoszyński, Krzeczowski and Załęczański. Its course is marked both by the tectonic substrate and the former outflow route of the waters from the Warcia glacier.
The next stage in shaping the varied landscape was the accumulation and then the huge erosion at the end of the Pleistocene, which caused a sudden indentation of the Warta and the Jurassic rocks were exposed in many places.
There is a significant number of inanimate nature objects in the Upland. These are examples of terrain forms as well as different types of rocks and fossils. The culminations are formed by inselbergs: Zelce mountain, St. Genowefy, Buki, Draby. Cracked calcareous substrate and aquifers of Quaternary sediments cause the outflow of water (sources: Pomegranate, st. Florian, Revelation). The variety of exposures of sedimentary rocks is characteristic. Only in the vicinity of Widoradz there are Triassic clays, all other places on the highlands are associated with Jurassic rocks. They are concentrated in two areas. The first covers the area Wieluń, where there are sandstones and conglomerates (Olewin), clays, sandstones and spherosiderites (with fossils of, among others, mussels, belemnites and ammonites in the former brickyard in Krzyworzece), sandy limestones (closed quarries in Wieluń). The second area is near Działoszyn, where limestones are dominant, where flint rolls with quartz crystals are common.
Local limestone is used in industry. The Warta cement plant operates here.
The wealth of nature is protected in Załęczański Landscape Park. The Węże geological reserve is very interesting.
