The year 2022 marks the thirtieth anniversary of the Convention on the Protection and Use of Transboundary Watercourses and International Lakes (Water Convention), which was adopted in Helsinki in 1992. Over the past three decades the Water Convention has served as a mechanism to strengthen international cooperation and implement national measures for the sustainable management and protection of transboundary waters. It provides an intergovernmental platform for the day-to-day development and advancement of transboundary cooperation. This publication showcases some of the success stories of the Water Convention's impact on the ground. It helps the reader to better understand the Convention's social, economic and environmental impacts as well as its benefits for peace and stability in different regional settings. In this way, the publication serves as an important resource to exemplify the benefits of transboundary water cooperation based on the Water Convention. This publication is intended for government authorities, basin organizations and other international organizations, development partners, non-governmental organizations and academia. It aims to strengthen the understanding of the benefits of the Water Convention, facilitate accession processes, and contribute towards the effective implementation of the Convention and improved transboundary water cooperation worldwide.