Tainhas State Park, State park in Rio Grande do Sul, Brazil

Tainhas State Park covers 6,654.67 hectares split between Jaquirana (69.8%), São Francisco de Paula (20.6%) and Cambará do Sul (9.6%), with its administrative center in São Francisco de Paula. The Tainhas River runs north through the valley toward the Rio das Antas, crossing flat-bottomed hills upstream and steep, forested residual relief downstream. Araucaria forest, upland grassland and peat bogs cover the terrain.

The park was created by state decree 23.798 on 12 March 1975 as a fully protected conservation unit. Its management plan was only published in September 2008, when 98 residents in 31 establishments were still raising cattle, practising family farming and forestry inside the area.

The Caaguara, called coroados for the feather headdresses they wore, lived in the Campos de Cima da Serra on fruits, seeds, game and fish. Portuguese sesmarias grants from around 1750 brought cattle ranching and family farming to the region. The Caaguara were wiped out in conflicts, first with the Kaingang and later with the bandeirantes.

As of 2016 the park was not open to visitors, so access to the Passo do S waterfall cannot be assumed. The falls lie in Jaquirana, where the Tainhas River crosses an S-shaped rock ledge 80 m wide and 15 m high. Hunting, fishing and camping around the falls are prohibited. When the river is low, the crossing can be made on horseback or on foot.

The Passo do S waterfall, in Jaquirana, is 80 metres wide and 15 metres high, where the Tainhas River crosses an S-shaped rock ledge. When the river is low, the crossing can be made on foot or on horseback. Hunting, fishing and camping around the falls are prohibited.