This report presents the results of the Expert Group Workshop on River/Lake Basin Approaches to Environmentally Sound Management of Water Resources which was held in Otsu and Nagoya, Japan, from 8 to 19 February 1988 under the joint sponsorship of the United Nations Centre for Regional Development (UNCRD), the International Lake Environment Committee Foundation (ILEC), and the United Nations Environment Programme (UNEP). The workshop was organized as an integral part of a three-year research project on river/lake basin approaches to water resources management, which was launched in 1987 jointly by UNCRD, ILEC, and UNEP. The joint project aims at producing, on the basis of the output of the project, training materials useful to water resources managers, regional planners and administrators in making better decisions on the use and management of water resources in a river/lake basin context.