Over the past three years Alice Oswald has been recording conversations with people who live and work on the River Dart in Devon. Using these records and voices as a sort of poetic census, she creates a narrative of the river, tracking its life from source to sea. The voices are wonderfully varied and idiomatic - they include a poacher, a ferryman, a sewage worker and milk worker, a forester, swimmers and canoeists - and are interlinked with historic and mythic voices: drowned voices, dreaming voices and marginal notes which act as markers along the way.