Jalapão's springs will not let you sink. Rain falls on the sandstone tablelands of eastern Tocantins and soaks down into the Urucuia aquifer, one of Brazil's largest underground reservoirs. The water is then pushed back up to the surface through beds of quartz sand. Wade into one of these springs, called fervedouros, and the rising water keeps lifting you back up. The sand churns under your feet as though it were boiling, but the water runs cold and gin-clear. Dozens of them surface across the region. The same sand shapes everything else: wind strips grains from the Serra do Espírito Santo and heaps them into burnt-orange dunes at its foot, while the Rio Novo folds over Cachoeira da Velha, a horseshoe of falls roughly 100 metres wide and 15 metres high, too violent to swim beneath. Tocantins protected the core of this cerrado in 2001 as Jalapão State Park — some 159,000 hectares of sand, savanna and buriti palm.
Getting here has always been the filter: Mateiros, the village at the centre, lies about 160 kilometres of red dirt beyond the last asphalt, and a long day in a 4x4 is still the price of entry. It is no longer a secret, though. A prime-time Globo telenovela shot in the park in 2017 put Jalapão in front of the whole country, and it now takes over 50,000 visitors a year — 50,302 in 2025. The dunes run on booked vouchers, timed entry windows and licensed guides who may lead no more than ten people at a time. None of those rules have changed what the days themselves are like. You climb the dune barefoot and watch the savanna open flat below you; you stand on the walkway at Cachoeira da Velha with the spray reaching you over the rail; and in Mumbuca, a Quilombola village of a few hundred people, artisans sew stalks of golden grass into bowls with thread stripped from buriti palm.