ARICA, a sea-port of Pera, in the department of Moquegua, in lat. 18° 28' S., and long. 70° 10' W. It was at one time a city of 30,000 inhabitants, and had a large export trade in wool, copper, and silver: but in consequence of civil war (1821) and earthquakes (1832, 1868), it has greatly declined; of late, however, it has shared in the general revival of Peru. The Government has taken measures for the improvement of the port, which 13 connected by railway with Tacna, about 38 miles inland, where many of the merchants reside. Population, about 4000.