Riverwatch is a celebration and insight into the wonders of Britain's diverse river life as it changes with the turn of the seasons. It comprises a collection of vignettes about nature revealing itself month by month to the patient river-watcher, touching upon the many values that rivers confer upon us and pausing for some deeper musings en route. These observations and insights are gleaned from a lifetime in thrall to rivers, enriched by many hours spent beside them as a scientist, naturalist and angler. Author is associate professor of ecosystem services at University of the West of England (UWE Bristol).