An accessible and visually engaging map-book, showcasing environmental information from research groups and projects in the Channel region. The aim of this atlas is to share and disseminate data, tools and scientific findings in an accessible and visually engaging way. It is aimed at a well-informed, but non-technical, audience, to improve scientific understanding, monitoring and management of water quality in the Channel region. The atlas has been created for the 3C’s project, which is one of five clusters created to capitalise on the outputs of projects funded through the Interreg IVa programme. The aim of the 3C project is to collate, share and disseminate the tools, techniques, data and best practices developed within the Interreg IVa FCE projects. 3C’s incorporates all facets of the hydrological cycle within catchment basins, including groundwater, rivers, transitional waters and the coastal zone, together with aspects of port and estuarine sediment quality.