Teresina is the capital and most populous municipality in the Brazilian state of Piauí. Being located in north-central Piauí 366 km from the coast, it is the only capital in the Brazilian Northeast that is not located on the shores of the Atlantic Ocean. With 871,126 inhabitants, Teresina is the 21st largest city in Brazil, and the 15th largest state capital in the country. Together with Timon in the nearby state of Maranhão, it forms a conurbation with a population of about 978,734 inhabitants; the entire metropolitan region of Teresina has over 1,226,509 inhabitants. The only natural barrier that separates Teresina from Timon is the Parnaíba river, one of the largest in the Northeast.
Teresina is the capital with the first best quality of life in the North-Northeast according to FIRJAN and the 4th in Brazil. It is among the 50 cities in the world with the highest murder rates, with 315 homicides in 2017.
Its motto is the Latin phrase Omnia in Charitatis, which means, in English, "All for charity". The city is the birthplace of, among others, Torquato Neto, who belonged to the Tropicalismo movement.