Załęże (German: Zalenze) is a part and a district of Katowice, located in the north-western part of the city, in the central part of the Upper Silesian conurbation, on the Rawa river. It runs along in a characteristic, winding course from the city center to the border of Chorzów. It also borders Osiedle Tysiąclecia, Dąb, Śródmieście, Załęska Hałda-Brynów, and Osiedle Witosa.
It is one of the oldest districts of Katowice, dating back to the 13th century. By the end of the 18th century, the community was an agricultural area, when it began to develop coal mining, iron and zinc industry, which enabled, among other things, rapid population growth. The main industrial plants that had a significant impact on the development of the settlement were the and the Baildon Steelworks. On 15 October 1924, Załęże became a district of Katowice. After the collapse of the major industrial plants in the early 21st century Załęże became mainly a service and residential center with a developed cultural base – two theaters are located there: and , as well as the entertainment center.
Development consists mainly of tenements and familoks from the turn of the 19th and 20th centuries, as well as residential and commercial buildings created after World War II. The most valuable objects in Załęże include the Gothic Revival and the , which is a remnant of a farm complex. Załęże is very well connected by the A4 motorway and Drogowa Trasa Średnicowa, as well as the international E 30 railway line and tram line. The district has an area of 3.39 km² (2.05% of the city's area) and at the end of 2020, it had 8,589 inhabitants.
Geography Location Załęże is one of Katowice's 22 districts (no. 7), belonging to the group of northern districts. It is located in the north-western part of the city and borders Osiedle Tysiąclecia and Dąb to the north, the city of Chorzów to the west (the district of Chorzów Batory), Osiedle Witosa and Załęska Hałda-Brynów to the south, and Śródmieście to the east.
According to physio-geographical regionalization, Załęże is located in the mesoregion, which forms the southern part of the Silesian Upland macroregion, which is itself is a part of the . Historically, it forms part of eastern Upper Silesia.
The boundaries of Załęże are: To the north – along the center of the Rawa riverbed between 1 Gałeczka Street in Chorzów and F. W. Grundmann Street in Katowice. To the east – along the former route of the siding to the Baildon Steelworks from the Rawa river (now F. W. Grundmann and M. Goeppert-Mayer streets) towards the Katowice railway station, where, near the railway viaduct over , it turns south-west and runs along the railway to Kochłowicka Street (A4 motorway). The border surrounds the locomotive depot area from the north and west along . To the south – from the viaduct over Kochłowicka Street (A4 motorway) over Katowice–Brynów railway along the southern side of the road to , where the border turns north and runs along the eastern side of this street to Katowice–Legnica railway. The border along this street is varied and surrounds the buildings at 56, 64, 64a, 66, 90, 92, 94, and 100 F. Bocheński Street from the east, including the Wschodni II shaft complex. The boundary then changes direction to the west and runs along the railway to the border between Katowice and Chorzów. To the west – the boundary also forms the border between Katowice and Chorzów. It runs west of J. Piecha Street in Katowice and parallel to P. Wysocki Street in Chorzów.
Historically, Gmina Załęże bordered Dąb to the north, Bogucice to the east, and later , Katowice, and Brynów, as well as Ligota and Kochłowice to the south, and Hajduki to the west. The boundaries were: To the north – along the Rawa river and through the building complex of the Baildon Steelworks. To the east – near the former route of the Baildon Steelworks siding and south along Przodowników Street to the intersection with Brygadzistów Street. To the south – along Brygadzistów Street and further west through the . To the west – along the present-day border between the cities of Katowice and Chorzów.
Geology and soils Załęże is located in the , in an area with horst structures. At the turn of the Devonian and Carboniferous periods, the Paleozoic bedrock of the Silesian Uplands was disturbed by the formation of a sinkhole, which during the Carboniferous was filled with conglomerates, sandstones, and shales containing bituminous coal deposits. The top of the Carboniferous strata is at an elevation of 220–240 m above sea level. Outcrops of Upper Carboniferous formations are located in the higher part of Załęże, in the area of the A4 motorway junction with . They consist of claystones, mudstones, and coal of the Załęże and Orzesze layers.
The remaining area of Załęże, in terms of surface formations, is composed of materials originating from the Cenozoic period. The valleys of the Rawa and its former tributary (the Osiek Stream, now known as Wujek Trench, running along the current eastern border of Załęże) – 250–350 m wide – are composed of the youngest materials – Holocene silts, sands, and river gravels. Holocene river sediments in the Rawa valley reach a depth of 6 meters. The remaining area of Załęże consists of Pleistocene eluvia of tills. Since between 2006 and 2007, the district has been considered geologically stable, mainly due to the abandonment of coal mining, and there is no mining damage there.
The soils in Załęże have been subjected to strong anthropogenic pressure as a result of settlement and industrial activity, which is why the proportion of initial soils is significant there. The soils in the district are mainly anthrosols, formed from tills. The classified soils in Załęże have a IV soil quality rating. They are contaminated with heavy metals (lead, cadmium, and zinc) caused by emissions, especially industrial, and coal combustion.
Terrain
According to morphological units, most of Załęże is located in the Rawa Depression, which stretches along the Rawa river valley. It is deeply incised (over 100 m) into Carboniferous formations and forms the bottom of the valley together with the Pleistocene terrace. The southern part of the district is located in the Kochłowice Hills, which are characterized by flattened terrain and deeply incised valleys. Załęże is characterized by a slight variation in surface area, which has been largely transformed as a result of anthropogenic pressure, especially in the form of spoil tips and embankments of transport routes – mainly railways (average 3.0–4.5 m) and roads: on Kochłowicka, John Paul II, and streets (the height of the latter embankment reaches 6 m). Levelling, sedimentation, and subsidence of various materials play an important role in changing the terrain of Załęże.
The surface of Załęże slopes downwards towards the northeast, in the direction of Rawa, following its course. The lowest point in the district is the Rawa riverbed (approximately 260 m above sea level), and the highest is Kochłowicka Street at the intersection with Żeliwna Street (approximately 285 m above sea level). On average, the eastern part of Załęże is located at an elevation of 265 m above sea level (the intersection of Gliwicka and streets, near Primary School No. 20 and the ). The western part is higher – the intersection of Gliwicka and streets is at 270 m above sea level, and is the highest, at 275 m above sea level.
The highest elevation within the historical boundaries of Gmina Załęże is hill (also known as Komarzy Summit), with a height of 338.8 m above sea level. Its summit is located in the , west of the buildings of . It is an inlier made of Upper Carboniferous rocks.
Climate The climate of Załęże differs only slightly from the conditions prevailing throughout Katowice. It is modified by both climatic and local factors, as well as by human activity (e.g., the urban heat island effect). The climate of the district is influenced more by oceanic than continental factors, and is occasionally modified by tropical air masses arriving from the southwest through the Moravian Gate. The average annual temperature recorded at the station in in the period 1961–2005 was 8.1 °C. The warmest month was July (17.8 °C) and the coldest was January (−2.2 °C). The average annual sunshine duration in the period 1966–2005 was 1,474 hours. The average annual precipitation in the period 1951–2005 was 713.8 mm. The average duration of snow cover is 60–70 days, and the growing season lasts on average 200–220 days. Westerly and southwesterly winds prevail, with an average speed of 2.4 m/s.
Surface and groundwater
Załęże is located entirely within the Vistula drainage basin, in the basin of the Rawa river. The river flows from west to east through the district, with its course is fully regulated and embanked. It receives treated and raw sewage as well as rainwater. Between 1992 and 2002, the share of foreign water (municipal and industrial sewage) was approximately 70%, which caused significant disturbances to the natural flow of water. In Załęże, the Rawa has one tributary – Wujek Trench, running along the eastern border of the district. However, there are no water reservoirs or ponds there.
The hydrological network in Załęże has undergone major changes as a result of ongoing urbanization and industrialization. Previously, there were a number of watercourses, including the Osiek Stream (which formed the eastern border of Załęże), the Obrocki Stream (which flowed northeast through the pond in the ), and the stream running along the current , flowing into the forge pond. As early as the 16th century, there were a number of dammed ponds in Rawa, which served the forges, were used as fish ponds, and were also intended to prevent flooding. The Załęże Pond, which no longer exists, was created at the end of the 15th century.
In terms of hydrogeological conditions, Quaternary and Carboniferous aquifers are distinguished. The Quaternary level in the formations is associated with loose sandy-gravel and sandy-silty intermoraine, fluvial-glacial, and fluvial sediments. It is a discontinuous level, locally separating (till sediments) into two or three aquifers. The Upper Carboniferous aquifer consists of aquiferous sandstones of the Upper Silesian sandstone series and the paralic series. Due to coal mining, the waters of the Carboniferous aquifer have been drained to the deepest exploitation levels throughout the entire Katowice.
Nature and environmental protection
The natural vegetation of Załęże has been shaped since the last glaciation 12,000–16,000 years ago. Its condition and abundance are influenced by several factors, including the terrain and water resources, and since the beginning of the 19th century, human activity has also had a decisive impact. Originally, the Rawa river valley was covered with marshes and peatland. These areas were overgrown with riparian forests and alder carrs, while further away from the valley there were oak-hornbeam forests, and on the hills in the southern part of Załęże there were beech woods. The forested past of the district is evidenced by its name – Załęże – meaning a place behind the riparian forest. The development of mining and metallurgy in this part of Katowice resulted in the destruction of significant forest areas in the 16th, 18th, and 19th centuries. Industrial and urban development was accompanied by environmental degradation, which in the second half of the 20th century reached proportions unseen in other parts of the country.