A metroplex is large metropolitan area containing several cities an their suburbs. It is also sometimes used as an alternative to metropolis or megalopolis, which is a chain of continuous metropolitan areas. The term was coined for, and is still commonly used to describe, the Dallas/Fort Worth Metroplex. Sometimes, a region is not clearly defined. It can be seen as a metroplex or a single metropolitan area (for example, Dallas - Fort Worth is closer to the definition of a metro and Norcal is closer to the definition of a megalopolis).