The story begins with gold. When prospectors followed the rumor of metal up into the ridges between the Araguaia and Tocantins watersheds in the 1740s, they built their huts where the ore was, not where water and land and road would later prefer. For decades Amaro Leite existed as a district attached to other places - the Comarca de Pilar in 1911, the municipality of Santana de Uruaçu in 1933, Uruaçu itself by 1953. The gold eventually thinned. The deposits that drew the first settlers are listed today as a geological inventory: phosphates, lead, copper, gold, silver. The bandeirantes had come for what glittered and stayed for what could be farmed.

In 1960 the settlement was transferred to another site. The records are laconic about why. What is certain is that a Brazilian municipality physically relocated itself, dropped its original name, and began again as Mara Rosa - a name woven from Maria and Rosa, a tribute to the wife of a benefactor. Few Brazilian towns have staged this kind of rebirth while keeping their legal continuity intact. Walk the streets today and you cannot find the original Amaro Leite; it has simply gone under the soil, a ghost grid beneath someone's pasture. The new grid runs about 356 kilometers north of Goiânia, 11 kilometers east of the Belém-Brasília highway, the great artery that opened the interior in the same decade Brasília itself was built.

The truly surprising fact about Mara Rosa has nothing to do with gold. It is Goiás's biggest producer of saffron. Goiás's saffron is not the Mediterranean crocus but the local acafrao-da-terra - Curcuma longa, turmeric, whose deep orange rhizomes color the meals of half the state. Drive the outskirts in September and the fields bloom in a low green mist; harvest in July and the roots come out in fistfuls, heavy and stained. Alongside the saffron grow corn, soybeans, rice, and the more familiar cerrado staples. The cattle herd is 120,000 strong on 76,000 hectares of pasture, and the town has two small industries - a dairy and a furniture maker - that employ a handful and feed the rest.

The most striking pattern in the numbers is departure. In 1980 Mara Rosa counted 21,524 people, most of them rural - 16,309 living on farms and smallholdings. By 2007 the rural population had collapsed to 2,700. The city itself barely grew; the people did not move to town, they simply left. The census paper trail follows them to Anapolis, Goiania, Brasilia - the big-city magnets of the Cerrado. Each census line is a small family decision, a door closed on a house that would not be reopened. The municipality today has fewer than seven people per square kilometer spread across an area roughly the size of Luxembourg.

What persists in Mara Rosa is a certain stubbornness. The town has survived gold booms, a physical relocation, a name change, and a rural exodus that hollowed out four-fifths of its countryside. It still has its schools, its two hospitals, its one bank, and its single dairy. It sits in a corner of Goias where the horizon rolls on toward the Araguaia and the Tocantins. The neighbors are places with similar stories: Porangatu, Estrela do Norte, Mutunopolis, Uirapuru. This is the interior Brazil never quite finishes building - always about to become something, always reinventing, always keeping one eye on the larger cities and one hand in the warm cerrado soil.