Columbia Road is a street in Washington, D.C., that forks from Connecticut Avenue north of Dupont Circle, and branches north and east through 16th Street to the McMillan Reservoir. Along its route, it marks the southern border of the Kalorama Triangle neighborhood, the principal east/west passage through the Adams Morgan neighborhood, and is one of the primary thoroughfares in the Columbia Heights neighborhood. In Adams Morgan, it is bordered by a great deal of street-level retail, constituting (with 18th Street) the main commercial area within Adams Morgan.