The São Francisco is the longest river to flow entirely within Brazilian territory, a 2,900-kilometer spine that runs north through the dry interior before bending east to the Atlantic. Pirapora sits at 472 meters elevation on its right bank, 340 kilometers from Belo Horizonte, and it owes its existence to a geographic accident: the rapids here. Upstream of the rapids, the river is navigable. Downstream, at least in the 19th century, it was navigable for hundreds of kilometers more. But the rapids themselves are a barrier, and wherever rivers force travelers to stop, settlements grow. Gold-panning bandeirantes pushed up the river in the colonial period, hit the Pirapora rapids, and founded a camp they called São Gonçalo das Tabocas. In 1911, the camp became a municipality and took the river's old Tupi name.

When Pirapora was formally incorporated in 1911, someone made an interesting choice. The new grid was laid out like a chessboard, inspired by the planned capital of Belo Horizonte then rising to the south, and the streets were given the names of Brazilian states. Walk Pirapora today and you walk through a miniature cartography of the country. The town became an important regional center, the second most industrially productive city in northern Minas after Montes Claros. Its population hovers around 56,640, in a municipality that covers roughly 549 square kilometers and stretches along the riverbank for several kilometers.

For much of the 20th century, Pirapora was a river port in the American sense. Paddle-wheel steamers modeled on Mississippi riverboats ran downstream toward Juazeiro in Bahia, loaded with passengers and cargo, burning charcoal made from the riverside forests. The trade stripped the vegetation, then the railroad arrived in 1910 and slowly stripped the trade. A 694-meter bridge was built across the river to carry the tracks, with plans to extend the line all the way to the Atlantic coast. The coast never came. In the late 1970s, the railway was deactivated, though the bridge and rails remain. One of the old paddle wheelers, the Benjamim Guimarães, is still anchored in front of the city as a floating monument, a reminder of when the river did the work that highways do now.

Irrigation changed Pirapora's economy. Drawing water from the São Francisco, farmers here grow table grapes, papaya, mangoes, cantaloupe, and guava in quantities that make the region a significant national producer of tropical fruit. Corn, beans, rice, manioc, tomatoes, lettuce, and bananas come from smaller plots. Beyond agriculture, the city supports an industrial park producing iron silicon, metallic silicon, and textiles. The microregion of Pirapora, an administrative grouping of nine nearby cities including Buritizeiro, Várzea da Palma, and Ibiaí, covers 23,111 square kilometers and holds roughly 150,000 people. The Centro Regional de Saúde da Visão, a public clinic specializing in eye surgery, draws patients from across northern Minas.

Even now, the event that gave Pirapora its name still happens. From late spring through February, mature fish leave the lower São Francisco and fight their way upstream to spawn. The rapids that stopped the steamboats still stop the fish, or at least slow them. Dams along the São Francisco and decades of pollution have reduced the runs from what they once were, and the piracema is nothing like the biblical surge that 18th-century travelers described. But when the season comes, the verb in the town's name still makes literal sense. Fish jump. And for a few weeks, the river proves that it is still alive enough to spawn.