Summary of Third, In-Person Meeting for International Working Group Developing Guidelines for Natural and Nature-Based Features: During October 30th – November 3rd, more than 75 people participated in the third, in-person meeting of the International Working Group that is developing guidelines for use of Natural and Nature-Based Features (NNBF). The meeting was hosted in Silver Spring, MD, at the National Oceanic and Atmospheric Administration (NOAA)’s Headquarters Complex. Collectively, attendees at this meeting represented 3 different countries and more than 30 different organizations. Mr. James Dalton (Director, USACE Civil Works), Dr. Jeff Payne (Director, NOAA’s Office for Coastal Management), and Dr. Eng Seng Loh (Director, Caterpillar’s Strategic Growth Projects-Earthmoving Division) offered opening remarks to the attendees. This 5-day, in-person meeting was an opportunity to review project progress, advance the development of 10 chapters, and identify/discuss NNBF Case Studies that will illustrate key concepts within applicable chapters. The meeting also provided valuable input through presentations of USACE, NOAA and Maryland Dept. of Natural Resources’ applicable programs/projects and afforded opportunities to conduct NNBF site visits in Maryland and Washington, DC.