Araguari sits in the northern Triangulo Mineiro, the distinctive triangle-shaped wedge of western Minas Gerais bounded by three rivers. The Paranaiba forms its northern edge, marking the boundary with Goias. To the south lie the waters of the Rio Grande. The Jordao River runs through the municipality itself, a tributary of the Paranaiba. The municipality covers 2,774 square kilometers, most of it rural: cattle ranches, coffee, sugarcane, and the permanent crops that have made the Triangulo one of Brazil's most productive agricultural regions. The land sits between 940 and over 1,000 meters above sea level, high enough to give the city a pleasant annual average of 20.7 degrees Celsius. The rainy season runs November through April, the dry season May through October, and the elevation keeps temperatures moderate. One source counts 128 waterfalls and rapids within the municipality - a landscape shaped by the Paranaiba drainage cutting through the cerrado plateau.

Settlement began in the early nineteenth century as ranchers pushed into the interior. Brejo Alegre grew slowly around its small chapel - the Igreja Matriz of Senhor Bom Jesus da Cana Verde, built in colonial style with a cemetery behind it. Houses were tiled but unsealed, called casas de telhas ao vento - "houses with tiles to the wind" - drafty and simple. The center was divided by a stream, with the Goias bank on one side and the Minas bank on the other, a division that expressed the uncertain geography of a frontier settlement. In 1843, the arraial became a district with the formal name Santana do Rio das Velhas. In 1882 it was elevated to a vila - a town - and in 1888 it became a cidade, a city, under the new name Araguari. The small commerce at that time consisted of a bakery, a shoe store, two pharmacies, and general stores called vendas. And then the trains came.

The Companhia Mogiana de Estrada de Ferro extended its line to Araguari in 1896, and the effect was transformational. The Mogiana was one of the great coffee railways of southeastern Brazil, built to move sacks from plantation to port. Araguari became its northern terminus, the point where freight transferred to wagons for the journey deeper into Goias. In 1906, the line was extended as the Estrada de Ferro Goias, pushing further north and making Araguari not just an endpoint but a gateway. The city grew along with the rails. Today, the downtown still preserves traces of that era - commercial facades from the early twentieth century, the Cine Teatro in the city center, the old Cinema Odete. Bosque John Kennedy, an urban tropical forest covering 112,000 square meters, survives as a green island inside the city grid, a reminder of the cerrado that once covered this plateau.

Modern Araguari's northern boundary runs along a string of hydroelectric complexes on the Paranaiba - Emborcacao and Miranda among them - whose dams have formed artificial lakes that now anchor regional tourism. Fishing, water sports, and lakeside recreation have filled in the gap between the city's industrial base and the agricultural economy of the surrounding ranches. Two more dams, Capim Branco I and II, were built in the same river system. By 2020, the municipality's population had reached 117,825, ranking among the top four cities in the Triangulo hierarchy. The city has grown faster than Brazil as a whole, a fact that says as much about Brazil's internal migrations - from northeast toward the industrial south, from small towns toward regional hubs - as about Araguari itself. The city that began as a drafty hamlet called Brejo Alegre now sits four hundred kilometers from Brasilia and six hundred from Sao Paulo, still on the rail line, still gaining ground.