Color-enhanced USGS satellite image of Washington, D.C., with the crosshairs in the image marking the quadrant divisions of Washington, D.C., with the U.S. Capitol at the center of the dividing lines. To the west of the Capitol is the National Mall, visible as a slight green band in the image. The Southwest quadrant is the smallest, located mostly on a fairly narrow strip of land along the Potomac River, which is the large river running from the upper left corner to the bottom center of the image.