Those who study in-migrations of the populations in modern Russia know how difficult it is to give accurate assessments of the scale of these processes within regions, between regions, and within the country. It is possible to define the trends, directions, the participants of these migrations, the obstacles which the migrants face, and the resources which they use for successful relocation. As for the scale of this phenomenon, it is extremely difficult to give accurate estimates. We have discovered a book whose authors immediately notice that it helps to understand how many people in Russia actually live in different places at different times of the day, the days of the week, and the seasons. For researchers, this thesis sounds very intriguing. The monograph of six scientific fellows of the Institute of Geography RAS is dedicated to the spatial (geographic) mobility of the population. Two types of return mobility, labour migration and seasonal migration of Russians to dachas, as well as the settlement systems formed by them (the rural-urban continuum), are analyzed in detail. The authors examine the background, directions, and scales of these migrations in determining regional differences. The study concerns the entirety of Russia, though the authors pay particular attention to its central and north-western regions. The monograph summarizes the longstanding elaborations of the authors, and provides a comfortable immersion into a quite extensive interdisciplinary subject. The series of geo-information systems in the form of schematic maps clearly demonstrating regional differences, sources and zones of migration and settlement systems raise the level of excellence of the monograph among other individual and collective studies of sociologists and demographers in this subject field.