The Graham Foundation hosts a panel discussion and reception to celebrate the launch of Third Coast Atlas: Prelude to a Plan. This recent publication describes the conditions for urbanization across the Great Lakes region and assembles a multi-layered, empirical description of urbanization processes within the drainage basins of the five Great Lakes and the Saint Lawrence River. This thick description encompasses a range of representational forms including maps, plans, diagrams, timelines, and photographs, as well as speculative design research projects and critical texts. Postponing diagnosis, let alone treatment of these conditions, Third Coast Atlas aspires to simply describe. It proposes a new geographic gestalt for urban analysis. Superimposed upon the North American continent, and with easily recognizable yet divergent political and geological borders, this megaregion traverses portions of eight U.S. states and two Canadian provinces, as well as the world’s largest collection of surficial fresh water.