Conurbation

A conurbation is an urban area that includes a number of cities, towns and villages which, through population growth and expansion, have physically merged to form one continuous built up area. It is a sort of agglomeration.

Thumb — Clickable schematic map of the Randstad, a big conurbation in the Netherlands

A metropolitan area usually combines one or several conurbations.

This short article about a place or feature can be made longer. You can help Wikipedia by adding to it.