Regional Geosystems . Volume 45, No. 4 2021", prepared by the team of authors, is an important and relevant publication for specialists, researchers and students interested in modern aspects of geosystem analysis and regional development. This publication is not just a collection of articles, but a deep immersion in the complex mechanisms of the formation and functioning of regional geosystems, their interactions, dynamics and stability in the face of rapidly changing global and local factors. The focus of this issue is on a variety of topics related to the study of the natural, economic and social components of regional systems. The authors reveal the peculiarities of geographical features, environmental challenges, problems of sustainable development and methods of their solution. A special place is occupied by the analysis of modern monitoring technologies, geographic information systems and modeling methods that allow us to understand how the various components of the region interact and influence each other. In this context, the book demonstrates how scientific approaches help to manage natural resources, minimize environmental risks and create conditions for the harmonious development of territories. Regional Geosystems . Volume 45, No. 4 2021 is not only a collection of scientific articles, but also a practical guide for those involved in planning, management and environmental protection. It raises critical topics such as climate change, urbanization, cross-border cooperation and the integration of environmental and economic strategies. The authors take an interdisciplinary approach, combining geography, ecology, economics and sociology, making the book a valuable source of knowledge for a wide range of readers. This publication is especially suitable for scientists, teachers, graduate students and students specializing in geography, ecology, regional studies and environmental management . It will be of interest to those who are looking for modern research methods, analytical tools and practical recommendations for solving topical problems of regional systems. In addition, the book can attract the attention of managers and civil servants responsible for the development of the territories, as it presents cases and examples of successful projects based on scientific data. The style of the authors is distinguished by clarity and scientific rigor, while they try to make the material as accessible and interesting as possible. In each section, logic is traced, supported by relevant data and analytical conclusions, which allows the reader not only to understand the theoretical foundations, but also to see the practical application of the knowledge gained. Overall, "Regional Geosystems. Volume 45, No. 4 2021” is a modern and in-depth study that helps to understand the complex interconnections in regional systems and to find ways of their sustainable development. If you are looking for a book that reveals the secrets of the interaction between nature and man at the regional level, and also offers modern approaches to the management and development of territories, this publication will be a valuable source of information for you. It is perfect for those who appreciate the scientific approach, analytical depth and practical orientation, and also seeks to be aware of the latest trends in the field of regional geosystematics. Overall, "Regional Geosystems. Volume 45, No. 4 2021 is not just a collection of articles, but a key to understanding the current challenges and opportunities in managing regions in an era of change.