Ciuda Autonomo-Œtudo del Arias
|— Autonomous city —|
|Unitary Autonomous District of Arias|
Arias, officially the Unitary Autonomous District of Arias, is the national capital of Mataia and the seventh-largest city. Arias has a population of 4,447,429 within its capital limits. The metropolitan area has 7 million people extending into two of its states.