The dragon boundary marks are cast iron statues of dragons on metal or stone plinths that mark the boundaries of the City of London. The dragons are painted silver, with details of their wings and tongue picked out in red. The dragon stands on one rear leg, the other lifted against a shield, with the right foreleg raised and the left foreleg holding a shield which bears the City of London's coat of arms, painted in red and white. This stance is the equivalent of the rampant heraldic attitude of the supporters of the City's arms.
The design is based on two large dragon sculptures, 7 feet (210 cm) high, which were mounted above the entrance to the Coal Exchange on Lower Thames Street, designed by the City Architect, J. B. Bunning, and made by the London founder Dewer in 1849. The dragons were preserved when the Coal Exchange was demolished in 1962–63. The two original statues were re-erected on 6 feet (180 cm) high plinths of Portland stone at the western boundary of the City, by Temple Gardens on Victoria Embankment, in October 1963.
The Corporation of London's Streets Committee selected the statues as the model for boundary markers for the city in 1964, in preference to the fiercer dragon by C. B. Birch at Temple Bar on Fleet Street. Half-size replicas of the original pair of dragons were made by Birmingham Guild Limited and erected at main entrances to the City of London in the late 1960s.
There are now thirteen dragons around the City of London. In addition to the Birch dragon at Temple Bar, and the two original Coal Exchange statues on Victoria Embankment, there are two replicas of the Coal Exchange design at the south end of London Bridge, two on High Holborn near Gray's Inn Road, and single replicas on Aldgate High Street, Bishopsgate, Byward Street, Moorgate, Goswell Road (north of Aldersgate Street), Farringdon Street, and at the south end of Blackfriars Bridge.
Outside London, there is also a replica at Lake Havasu City, Arizona, where the 19th-century London Bridge was reconstructed in 1971.