Géographie du cycle de l'eau is a comprehensive French textbook that explores the physical, chemical, and ecological processes governing the water cycle. Authored by Roger Lambert, a professor at the University of Toulouse‑le‑Mirail, the book offers a detailed examination of precipitation, evaporation, transpiration, runoff, and groundwater movement. It integrates case studies from French and global contexts, illustrating how climate, land use, and human activity influence water distribution and quality. The text is organized into clear chapters that progress from fundamental concepts to applied hydrology, making it suitable for advanced undergraduate and graduate courses in geography, environmental science, and related disciplines. With 439 pages of richly illustrated diagrams and tables, the book serves as both a reference guide for researchers and a pedagogical resource for students seeking a rigorous understanding of the Earth's hydrologic system.