The aim of this paper is to provide an overview over theoretical background of tourism function issue and to analyze its spatial composition in the counties of Mazovia region. Firstly, the author discusses the theory of tourism function and indicates some barriers involving its measurement. Secondly, tourism function has been analyzed by using partial indexes referring to tourism movement, tourism features and tourism values in the researched counties. Then, synthetic tourism function index has been calculated and analyzed and finally, the relation between tourism intensity and natural and anthropological resources have been researched.

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