Interstate 495 in the state of Maryland and Commonwealth of Virginia in red surrounds the District of Columbia like a "belt", hence the name.
based on <a href="//commons.wikimedia.org/wiki/File:Capital_Beltway_Map_Color.png" title="File:Capital Beltway Map Color.png">Image:Capital Beltway Map Color.png</a> by <a href="//commons.wikimedia.org/w/index.php?title=User:Squiggygfm&amp;action=edit&amp;redlink=1" class="new" title="User:Squiggygfm (page does not exist)">Squiggygfm</a>
<span class="int-own-work" lang="en">Own work</span>