Abstract
The shifting of the shoreline is a natural phenomenon closely related to the existence of watercourses. One of its consequences is the need to periodically update the real estate cadastre with regard to parcel boundaries and their owners. Land use types use are also subject to updates, which bears particular significance in this context. This article presents the most essential practical aspects of establishing the shoreline in Poland, including the identification of property boundaries located in the immediate vicinity of watercourses. The main problems associated with conducting the process of demarcating land under water are discussed using selected technical reports as examples. Attention is drawn to the numbering of parcels resulting from the implementation of the analyzed procedure, as well as the precision of recording surface areas. Moreover, the consequences of changing the natural watercourse shoreline and the limitations imposed on property ownership rights are presented, along with the issue of compensation claims.