wikipedia
Underbyrg sind gebūna scīra þe licgaþ ǣghƿæðer ge on þǣm outer rim sumre burge ge outside the official limits sumre burge (the term varies from country to country), or the outer elements of a conurbation.

Ūtanƿearde bendas and references 

 Managing Urban America by Robert E. England and David R. Morgan 1979
 http://www.ideal-homes.org.uk/why-suburbs-happen-01.htm  on the suburban growth of London, England.
 http://www.hgs.org.uk/mystreet/index.html provides images of a mature north London suburb illustrating a wide range of domestic architecture.

Metropolitan areas