Abstract
Previous geographical regionalization of Bosnia and Herzegovina executed into two level or degrees: macroregional (region) and moesoregional (subregion). In this paper went to farther in separating smaller territorial complex in the Una Sana Canton. The leading criterions were physicalgeographical elements of a given space, or physiognomic principle of geographical regionalization. In this paper, in Una Sana Canton there are separate four physicalgeographical units, and within them, seven parts.
Keywords: Una Sana Canton, regionalization, physical-geographical determinants, smaller territorial units