Teresina is the capital city of the state of Piauí, located in northeastern Brazil. It is the only capital city in Brazil that is not located on the coast. Teresina is known for its hot, semi-arid climate, with temperatures often reaching over 40 degrees Celsius (104 degrees Fahrenheit). The city has a population of approximately 860,000 people, making it the 19th largest city in Brazil. Teresina is a major economic and commercial center in the region, with industries including textiles, food processing, and agribusiness. The city is also home to several universities and healthcare facilities. Notable landmarks in Teresina include the Poty Velho Bridge, the Teresina Metropolitan Cathedral, and the Karnak Palace, which serves as the official residence of the Governor of Piauí.