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Piauí(pyouē`), state (1991 pop. 2,582,137), 96,886 sq mi (250,935 sq km), NE Brazil, on the Atlantic Ocean. TeresinaTeresina
, city (1991 pop. 599,272), capital of Piauí state, NE Brazil, on the Parnaíba River. It is the main commercial and agricultural distribution center in the Parnaíba valley; cattle, hides and skins, rice, wax, beans, and cassava are shipped through
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a state in northeastern Brazil, in the Parnaíba River basin. Area, 250,900 sq km. Population, 1,700,000 (1970). The capital and economic center is Teresina. There is pasturing of livestock in Piauí, and manioc, rice, and sugarcane are grown. Carnauba wax is produced. Industries include food processing, textiles, and leather footwear.