EN
Each settlement unit creates a round it a zone on which it exerts an influence, and which is called the key region. The primary ties between the town and the region are reflected in flows of population, goods, and information, while the secondary ties are expressed in the changing structure and appearance of the surrounding area. The zone of Łódź influence has been determined according to the followtng formula. It encompasses the area of administrative provinces of Łódź, Sieradz, Piotrków, and certain administrative districts in provinces of Kalisz, Konin, Włocławek, Płock and Skierniewice. It the present natural, and socio-economic conditions of Central Poland the key region of the administrative urban province of Łódź may be treated as its food zone, which was confirmed by theoretical and empirical studies.