Abstract <p>The results of a spatial connectivity study of territorial subpopulations of wild forest reindeer in the Republic of Karelia based on satellite telemetry data collected during the period 2015–2025 are presented. It is shown that during the winter season wild forest reindeer utilize areas of other subpopulations. The fidelity to summer pastures indicates that the spatial distribution of individuals during this season should be the primary basis for determining the territorial structure and subpopulation affiliation. The patterns of summer and winter habitat use and extraordinary long-distance movements of wild forest reindeer may contribute to maintaining connectivity even between geographically distant subpopulations.</p>