Campo de Cartagena is a natural region (comarca) located in the Region of Murcia, in Spain. For administrative purposes, it is also known, as Comarca del Campo de Cartagena or Comarca de Cartagena. It is located in the southeast of the Iberian Peninsula, forming a plain which extends from the Sierra de Carrascoy to the Mediterranean. The capital city is Cartagena, the most important Naval Base of the Spanish Navy in the Mediterranean Sea.