The hook
An old diamond-mining highland in the Bahian interior, now a national park of flat-topped ranges cut by canyons: 380-metre waterfalls, caves holding water so clear and blue it looks lit from below, and river-worn rock that runs like polished timber.
01Why it's worth it
Chapada Diamantina is the great trekking landscape of Brazil, and it stays surprisingly quiet because it's a long way inland from the coast everyone flies to. The scale is what registers: the Cachoeira da Fumaça drops so far that the water disperses into smoke before it lands, and you can lie at the lip and look down it. The Poço Encantado and Poço Azul are flooded caverns where, when the sun angle is right, light strikes the water and turns it an unreal blue over a submerged floor. The Vale do Pati, a valley of remote farmsteads reached only on foot, is widely called the best multi-day trek in the country, sleeping in family homes along the way. Add the Cachoeira do Buracão's amphitheatre, slot canyons, and river slabs like Ribeirão do Meio you slide down into pools. Trails are genuinely rugged and often unmarked, guides are the norm rather than an upsell, and the old mining town of Lençóis is the base for arranging them.
02How to experience it
Base in Lençóis and hire a guide, this is not a place to wander unaccompanied. Day trips reach Fumaça, Buracão, and the blue caves; give three or four days to the Vale do Pati if you can walk. Come in the drier months for safer trails, and bring boots that can get wet, most days involve river crossings.
From the locals
Brazilians route visitors here for exactly the reasons it deserves: "Chapada Diamantina in the state of Bahia. Well worth the trip," one wrote — "stay at Lençóis and arrange a guide for a few days of camping and hiking along canyons, plateaus, waterfalls, and caves. In a day's hike you will go through at least 3 completely distinct biomes." Another, asked when to come: "June is one of the best months to visit our national parks."