The book *Geology. Part III: Hydrogeology* by Anatoly Moiseevich Galperin offers an engaging and in-depth exploration of one of the most vital branches of geological science—hydrogeology. This work serves as an essential resource for both students studying geology and professionals working in water resources and environmental fields. Hydrogeology is the science that investigates underground waters—their origins, movement, and interactions with the environment. In this third installment, Galperin immerses readers in the world of groundwater, highlighting its crucial role in ecosystems, the economy, and society at large. The book covers a broad range of topics, including hydrogeological research methods, techniques for assessing underground water reserves, and the impact of human activity on water resources. What makes this book particularly valuable is its accessibility to a wide audience. Anatoly Moiseevich Galperin, a renowned Russian scientist and author of numerous scientific works, combines rigorous scientific clarity with a clear, engaging style. He skillfully incorporates practical examples, allowing readers not only to grasp theoretical concepts but also to see how they apply in real-world situations. This book will appeal not only to students and graduate researchers in geology and environmental sciences but also to practicing geologists, engineers, and environmentalists. It is a useful guide for those involved in designing and managing water resources, as well as for researchers working in environmental protection. The topics addressed are highly relevant in light of current ecological challenges. Galperin discusses issues such as groundwater pollution, depletion, and the urgent need for sustainable water management. In the context of global climate change and increasing anthropogenic pressure on nature, hydrogeological questions have become more critical than ever. The book encourages readers to reflect on the importance of conserving and protecting our water resources for future generations. Galperin’s clear and logical style makes this work accessible even to those without extensive geological backgrounds. He masterfully blends theory with practical examples, enabling readers to not only understand the material but also to apply it professionally. If you are seeking books on geology, ecology, or hydrogeology, *Geology. Part III: Hydrogeology* will be a valuable addition to your library. It will expand your knowledge and deepen your understanding of the importance of safeguarding water resources. In a world where ecological issues are becoming increasingly urgent, Galperin’s work is more than just a scientific publication—it’s a call to action, urging us to adopt a conscious and responsible attitude toward nature. In summary, *Geology. Part III: Hydrogeology* is a book that will resonate with anyone interested in the natural world, its laws, and how we can preserve it for future generations.