High-Resolution Image

Red areas here would be underwater if Greenland collapsed into the sea, thus causing global sea level to rise by 6 meters, or about 20 feet. Source: University of Arizona. Note in particular the submergence of DC National Airport, and also Roosevelt Island, immediately opposite the airport. Portions of the Capitol Mall are also submerged, as well as much of the lower Anacostia River and portions of its tributaries and basins.