The São Francisco River is Brazil's longest river that runs entirely inside the country, flowing 2,914 km (1,811 mi) from the Serra da Canastra in Minas Gerais north through Bahia, then east along the borders of Pernambuco and Alagoas, to reach the Atlantic between Alagoas and Sergipe. Its basin covers more than 630,000 km², and because it carries water from the wetter Southeast across the drought-prone sertão of the Northeast, Brazilians call it the "river of national integration" and, affectionately, the Velho Chico. Five large dams on its course generate power, four of them run by the Northeast's federal utility, irrigated orchards around Petrolina and Juazeiro grow about 90% of Brazil's mango exports, and since 2017 its water has been pumped through canals into the dry interior of four northeastern states.
Opára, Kaleshí and the Feast Day of 4 October 1501
Long before it had a saint's name, the river had several. The now-extinct Natú language called it Opára, and the Tuxá, whose language is also extinct, called it Kaleshí. Tuxá, Truká, Natú, Kariri, eastern Maxakalían and Jê languages were all spoken in the basin, alongside languages that were never classified before they disappeared. The lower river around Penedo was home to speakers of Wakoná, another extinct language; descendants who speak only Portuguese were recorded in the 20th century at Porto Real do Colégio, a riverside town upstream.
The Portuguese name dates from 4 October 1501, when the Italian navigator Amerigo Vespucci, sailing for Portugal, saw the river mouth on the feast day of Saint Francis of Assisi. The nickname Velho Chico, "Old Frank", uses chico, the everyday diminutive of Francisco. Later visitors used it to reach the interior: the British explorer Richard Francis Burton, posted to Santos in 1865, later canoed down it from its source to the falls of Paulo Afonso.
Gold Seekers on the Das Velhas and Cattle Towns on the Banks
The longest tributary, the Rio das Velhas, joins the main river at Barra do Guaicuí in Várzea da Palma, Minas Gerais. It rises at the Andorinhas waterfall in Ouro Preto and runs past Sabará, Santa Luzia and Belo Horizonte, and it was one of the main routes of the Minas Gerais gold cycle. One line of academic research suggests that explorers from the Northeast found the gold by walking up the São Francisco and then the Das Velhas, a longer but more natural route than the mountain tracks from Rio de Janeiro or São Paulo.
Gold drew people upstream; cattle kept them there. For many years the valley's economy rested on extensive cattle ranching and subsistence farming. Penedo, on the lower river in Alagoas, was founded in 1614 and keeps 18th-century churches including the Convento de São Francisco; in 2023 it joined the UNESCO Creative Cities Network as a City of Film. Bom Jesus da Lapa in Bahia, founded in 1693 around a cave converted into a chapel, had 65,550 residents in the 2022 census, yet its annual Romaria pilgrimage draws as many as 800,000 visitors, making it the third-largest Catholic festival in Brazil. Upstream, Pirapora in Minas Gerais (55,606 people in 2022) takes its name from the Tupi for "fish" and "jump", after the spawning runs that once leapt its rapids.
Gaiolas, Carrancas and the 1,371 km Pirapora–Juazeiro Waterway
Before the big dams, the river was a road. It is naturally navigable all year for 1,371 km between Pirapora and the twin cities of Petrolina and Juazeiro, although depth swings by up to 6 metres between rainy and dry seasons on the 1,015 km stretch down to Pilão Arcado. Passengers and freight travelled on gaiolas ("cages"), paddle-wheel steamboats, some of them former Mississippi riverboats dating from the American Civil War era. The railway from the coast still ends at Juazeiro's river port.
Boatmen on the lower river fixed carrancas to their bows: carved figureheads, usually a human or animal face painted chalk white with black hair, a gaping red mouth and fangs, meant to scare off river spirits and to identify which trader owned the boat. Authentic examples now sit mainly in museums, including four on the front of the house of the landscape designer Roberto Burle Marx in Rio de Janeiro, while souvenir versions are carved for tourist shops in Bahia, Pernambuco, Sergipe and Alagoas.
The steamboat era ended after the Sobradinho Dam created a reservoir long enough to raise short, steep waves, and after deforestation and upstream irrigation reduced the flow and built sandbanks in the middle course. One boat survives in service: the Benjamim Guimarães, built by James Rees and Company in Pittsburgh in 1913, which moved to Pirapora in the 1920s and now runs tourist trips downstream toward the mouth of the Das Velhas. It is the only working steam paddle boat in Brazil.
Fishers, the Piracema and More Than 200 Species
Fishing families depend on a fauna that is largely found nowhere else. More than 200 fish species are known from the basin, and about 64% of them are endemic, among them the flattened catfish Lophiosilurus alexandri, the armoured catfish Franciscodoras marmoratus, Pygocentrus piraya (the largest piranha species) and Salminus franciscanus, a relative of the golden dorado. About 13% of the basin's species are important to fisheries, and about 10% are threatened. Over 40 species of annual killifish live in seasonal pools in the basin.
The problem for fishers is that many commercial fish migrate upstream to spawn during the piracema, the same runs that named Pirapora. The Três Marias Dam, begun in May 1957 and completed in 1961, has no fish ladder and effectively halted fish migration in the upper river, splitting it into two zones. Dams further down have the same effect, and pollution adds to the pressure; mass fish deaths have been recorded on the river.
Five Dams from Três Marias to Xingó
Electricity reshaped the lower river. In January 1913 the industrialist Delmiro Gouveia built the 1.1 MW Angiquinho plant at the Paulo Afonso Falls, the first hydroelectric station in northeastern Brazil. The federal Companhia Hidro-Elétrica do São Francisco (CHESF) was formed in 1945, and President João Café Filho inaugurated Paulo Afonso I, Brazil's first large power plant, on 15 January 1955. The falls, which drop about 84 metres in total, now act mostly as a spillway in wet years.
Four more large dams followed, the last three built and run by CHESF: Três Marias in Minas Gerais (1961), Sobradinho in Bahia (completed 1982), Luiz Gonzaga, formerly Itaparica, between Bahia and Pernambuco (built 1979–1988, displacing about 40,000 people, many of them Tuxá, and renamed after the musician known as the "king of baião"), and Xingó on the Alagoas–Sergipe border (1987–1994). Sobradinho's reservoir covers 4,214 km² and stores about 34.1 km³, and it holds 60.4% of the Northeast's hydroelectric reserves, enough in principle to guarantee two years of supply, though its level varies sharply in drought years.
The dams also changed how riverside towns earn a living. The canyon between Paulo Afonso and Xingó, part of it now flooded by the Xingó reservoir, became a tourist landscape instead; 26,736 hectares of it are protected as the Rio São Francisco Natural Monument. Piranhas, an Alagoas town that was once the end of a railway, has restored its abandoned historic buildings for visitors who come to take boat trips through the gorge.
Mangoes and Table Grapes in Petrolina and Juazeiro
The clearest example of a livelihood built on the river sits a short way below the Sobradinho Dam. Petrolina, on the Pernambuco bank, had 418,444 people in 2025, and with Juazeiro across the President Dutra Bridge in Bahia it forms an urban area of close to 700,000. Juazeiro is one of the driest places in Brazil, with a hot semi-arid climate close to true desert, yet the two cities may be the only place in the interior of the Northeast to have gained population through in-migration: between 1970 and 1990, while Pernambuco and Bahia grew by about half, Petrolina–Juazeiro more than doubled.
The reason is irrigation. From the 1960s federal policy brought roads, electricity and the public irrigation schemes of Bebedouro and Senador Nilo Coelho, followed by factories for tomato paste and juice. Growers here now produce about 90% of Brazil's mango exports and about 30% of its table-grape exports, flown out by cargo aircraft to Europe and the United States, plus bananas, coconuts, guavas, melons, onions and watermelons for the home market. Juazeiro calls itself the "capital of irrigated fruit". Juazeiro is also the birthplace of some of Brazil's best-known musicians, including João Gilberto, the father of bossa nova, and the singer Ivete Sangalo.
Canals to the Sertão: The Transposition from Cabrobó
The newest group of people who depend on the river live outside its basin altogether. In 2005 the federal government proposed diverting São Francisco water to the semi-arid interiors of Ceará, Pernambuco, Paraíba and Rio Grande do Norte, with the northern axis drawing water near Cabrobó in Pernambuco and the eastern axis from the Itaparica (Luiz Gonzaga) reservoir at Floresta. Environmentalists argued that the scheme would mostly benefit large landowners while damaging the river; the government replied that people in the four states needed a reliable water supply.
Water on the eastern axis crossed into Paraíba at Monteiro on 8 March 2017, and from April it was refilling the Boqueirão reservoir that supplies Campina Grande. Water first reached Jardim de Piranhas in Rio Grande do Norte on 9 February 2022, but flowed for only 15 days because the works were unfinished; it arrived there without interruption on 13 August 2025, running down the bed of the Piranhas–Açu River toward the Oiticica and Armando Ribeiro Gonçalves reservoirs. In May 2025 an order was signed to double pumping on the northern axis, at stations in Cabrobó, Terra Nova and Salgueiro, from 24.75 to 49 m³/s, a project costing 491.3 million reais and due in 2027 that is meant to serve 237 municipalities and about 8.1 million people.
Those canals show how far the Velho Chico's reach now extends beyond its banks, from fishers at Pirapora to fruit packers in Petrolina and households in Paraíba. For the plateau country where the river rises, see our guide to the Brazilian Highlands, and for how it fits among the Amazon, the Pantanal and the coast, read our overview of Brazil's geography.