The Department of the Interior (DOI) Nature-Based Solutions Roadmap is a comprehensive resource to support DOI staff, partners, and anyone interested in implementing nature-based solutions (NBS). This first-of-its-kind reference was created by the Nicholas Institute in collaboration with DOI and includes 29 strategy overviews, 400+ case studies, key considerations for nature-based solutions project development, and ideas for transitioning from gray infrastructure toward natural infrastructure.