Piauí, in northeastern Brazil, is a dry, sprawling state with Teresina as its inland capital—the only one not on the coast—near the Parnaíba Delta’s dunes. Known for carnauba wax, cashews, and prehistoric fossils, its economy leans on farming and nascent tourism, like Serra da Capivara’s rock art. Its sertão grit and river oases endure. Piauí’s quiet wildness whispers.