In this paper the problem of western border of the Tatra Mts was studied. It is the interesting example of using different criteria in delineating borders. There is a number of views into its course in Slovak and Polish literature. The difference between the extreme variants is about 10 kilometers.In June 2000, the author studied the natural environments variability in the western part of the Tatra Mrs and described about 70 kilometers of physicogeographic borders, using a special form. The result of the field work was a typology of physicogeographic borders. The author distinguished 7 types of borders: morpho-tectonic, litho-morphological, lithological, morphological, orographic and anthropogenic borders. According to these types the border of Tatra National Park (TANAP) was analysed and the suggestions to delineting borders of protected areas were given.