The concept of a cohesive Salish Sea region has become a critical focal point for local education, research, restoration, conservation, and policy development. The scarcity of accurate, cohesive, and easily available spatial data and thematic maps covering the entire bioregion is a critical impediment to the efforts. The Salish Sea Atlas aims to address this need with an open access digital book containing maps, illustrations, interpretive text, and downloadable geospatial datasets addressing cultural and environmental themes across the Salish Sea Bioregion.