- a seaport in N Chile.
- See under Tacna-Arica.
- a maritime region in W South America: long in dispute between Chile and Peru; annexed by Chile 1883; divided as a result of arbitration 1929 into a Peruvian department (Tac·na) and a Chilean department (Arica).
- a port in extreme N Chile: awarded to Chile in 1929 after the lengthy Tacna-Arica dispute with Peru; outlet for Bolivian and Peruvian trade. Pop: 180 000 (2005 est)See also Tacna-Arica
- a coastal desert region of W South America, long disputed by Chile and Peru: divided in 1929 into the Peruvian department of Tacna and the Chilean department of Arica