Qualla: Toca da Boa Vista https://qualla.com/toca-da-boa-vista en-us © 2026 Bendyline Mon, 14 Sep 2026 09:25:05 GMT Qualla serial false Qualla support@bendyline.com yes https://qualla.com/_m/7/n/4/y/toca-da-boa-vista-wp/hero-small.webp Qualla: Toca da Boa Vista https://qualla.com/toca-da-boa-vista Toca da Boa Vista: Introduction https://qualla.com/toca-da-boa-vista/ Photo credit Original uploader was Dave Bunnell at en.wikipedia, CC BY-SA 2.5. Most caves are made from the top down. Rain picks up carbon dioxide on its way through the soil, turns mildly acidic, and spends a few hundred thousand years eating a hole in the limestone below. Toca da Boa Vista was made the other way round. The acid came up from underneath, it was sulfuric rather than carbonic, and it was manufactured by microorganisms living in the groundwater. The result, in the dry hills of Campo Formoso in Bahia, is 114 kilometres of passage — the longest cave known in Brazil, and a place almost nobody is allowed to enter.

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Image: Original uploader was Dave Bunnell at en.wikipedia | CC BY-SA 2.5

]]> Fri, 04 Sep 2026 00:00:00 GMT https://qualla.com/_m/7/n/4/y/toca-da-boa-vista-wp/7n4y-toca-da-boa-vista-intro.mp3 0:06 1 full Toca da Boa Vista: The Chemistry of an Older Ocean https://qualla.com/toca-da-boa-vista/ Photo credit Original uploader was Dave Bunnell at en.wikipedia, CC BY-SA 2.5. The rock here is dolomite of the Salitre Formation, part of the Una Group, laid down in the Ediacaran roughly 600 million years ago at the tail end of the Precambrian. That timing matters more than it sounds. The Ediacaran is the moment multicellular life is getting started, and ...

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Image: Original uploader was Dave Bunnell at en.wikipedia | CC BY-SA 2.5

]]> Fri, 04 Sep 2026 00:00:00 GMT https://qualla.com/_m/7/n/4/y/toca-da-boa-vista-wp/7n4y-toca-da-boa-vista-the-chemistry-of-an-older-ocean.mp3 0:06 2 full Toca da Boa Vista: A River of Carcasses https://qualla.com/toca-da-boa-vista/ Photo credit Original uploader was Dave Bunnell at en.wikipedia, CC BY-SA 2.5. Around twenty thousand years ago, water ran into the cave carrying dead animals with it, and kept doing so long enough to build deposits of bone on a scale that has no real parallel in South American caves. More than fifty thousand bones have been excavated so far.\n\nMuch of it ...

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Image: Original uploader was Dave Bunnell at en.wikipedia | CC BY-SA 2.5

]]> Fri, 04 Sep 2026 00:00:00 GMT https://qualla.com/_m/7/n/4/y/toca-da-boa-vista-wp/7n4y-toca-da-boa-vista-a-river-of-carcasses.mp3 0:06 3 full Toca da Boa Vista: The Title It Used to Hold https://qualla.com/toca-da-boa-vista/ Photo credit Original uploader was Dave Bunnell at en.wikipedia, CC BY-SA 2.5. In 1999, the speleologists Augusto Auler and Peter Smart published a paper describing Toca da Boa Vista as the longest known cave in the Southern Hemisphere. They were right at the time. The claim has been repeated ever since, occasionally with some stubbornness, and it is no lon...

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Image: Original uploader was Dave Bunnell at en.wikipedia | CC BY-SA 2.5

]]> Fri, 04 Sep 2026 00:00:00 GMT https://qualla.com/_m/7/n/4/y/toca-da-boa-vista-wp/7n4y-toca-da-boa-vista-the-title-it-used-to-hold.mp3 0:06 4 full Toca da Boa Vista: Why You Cannot Go In https://qualla.com/toca-da-boa-vista/ Photo credit Original uploader was Dave Bunnell at en.wikipedia, CC BY-SA 2.5. There is no ticket office and no boardwalk. Toca da Boa Vista lies about 11 kilometres east of the town of Lage dos Negros, in the Campo Formoso municipality on the northern edge of the Chapada Diamantina, and it is closed to casual visitors for reasons that have nothing to do wi...

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Image: Original uploader was Dave Bunnell at en.wikipedia | CC BY-SA 2.5

]]> Fri, 04 Sep 2026 00:00:00 GMT https://qualla.com/_m/7/n/4/y/toca-da-boa-vista-wp/7n4y-toca-da-boa-vista-why-you-cannot-go-in.mp3 0:06 5 full