This paper analyzes the evolution of the concept of Integrated Water Resources Management (IWRM) at international conferences over the past three decades and addresses the prospects of IWRM in resolving the current water crisis. It also identifies seven crucial challenges to implementing IWRM. Our rivers and aquifers are the life-blood of the planet. To achieve sustainable development, we must manage our most vital natural resource, water, in an integrated manner, or precisely through Integrated Water Resources Management. Since water is fundamental to many aspects of life, and to the surrounding natural environment, there is a need not only to review IWRM's evolution in the last three decades, but also to identify future challenges to its implementation. KEYWORDS: water resources, water management, sustainable development, conferences, international agreements, rivers, world problems, developing countries, water conservation.