TUCUMAN, a province of Paraguay, in South America, bounded on the north by the provinces of Los Chicas and Choco; on the east by Choco and Rio-de-la-Plata, on the south by the country of Chicuitos and Pampes, and on the west by Chili. The air is hot, and the soil sandy; however, some places are fruitful enough. It now forms part of the republic of Buenos Ayres. See BUENOS AYRES, SUPPLEMENT.