|Location:||Petar National Park, Santana Center. 3km from the Bairro Serra (Serra Village) in Iporanga. 2km walk from the center to the cave.|
|Classification:||Karst cave, river cave.|
|Address:||Caverna Água Suja.|
|As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
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Caverna Água Suja is a river cave. The visitor enters the cave walking in the brook, which leaves the cave through its entrance. The trip is about 1,000m long, walking into the cave 500m to a 2m high waterfall, which makes any proceeding impossible. Then the visitors turn around and go back the same way.
The whole tour is done walking through the water. The river gets sometimes deeper, but never more than 1.50m. Despite the rather high water temperatures, this cave trip is suitable only to physically fit visitors. Water proof light and wellingtons are a very good idea.
As it is a river cave, there are not many speleothems. Noteworthy are some rimstone dams.