“…Studies usually focus on already amalgamated (Swianewicz and Szmigiel-Rawska, 2020) or split units (Swianewicz et al ., 2016;Swianewicz et al, 2018). A clear research trend has also developed regarding the processes of territorial integration and disintegration of urban areas (Jarczewski, 2002;Kociuba, 2019;Krzysztofik and Dymitrow, 2015;Szmytkie, 2014;Szmytkie and Krzysztofik, 2019) and new cities (Drobek, 2020;Konecka-Szydłowska et al, 2018;Krzysztofik and Dymitrow, 2015;Liszewski et al, 1989;Sokołowski, 2014;Szymańska, 1993). Less attention is paid to changes in the boundaries of parts of units and related studies usually apply to the territorial expansion of cities (Kociuba, 2019;Rajchel, 2018) or counties (Swianewicz et al, 2016).…”