EN
The objective of the paper is to show the value of descriptions of parishes used as a basis for the 'detailed map' of the Podlasie province by K. de Perthées. To this aim a comparative analysis was carried out of the content of the map of the Podlasie province of 1795 with source materials; volume 12 of the Geographic statistical description of the parishes of the Kingdom of Poland, Textor's map on a scale of 1:150,000, and a pre-World-War-Two topographic map on a scale 1:300,000. It turned out that the basis for K. de Perthées 'detailed maps' was constituted by descriptions of parishes of the whole Polish-Lithuanian Commonwealth obtained by means of a questionnaire. This diverse and rich material was used by de Perthées to make synopses and sketches for each parish and decanate. An initial analysis of the map and descriptions indicates that the descriptions are richer in content than the map. The authoress concludes that the descriptions constitute a valuable source for historical-geographical research. The actual value of the representation in the map is increased thanks to the existing sources.