The Rio Parafuso is a tributary of the Rio Poti, located in the municipality of Juazeiro do Piauí in the state of Piauí, Brazil. It flows through the Cânion do Rio Poti, one of the more visually striking landscapes in the region, and its confluence with the Rio Poti — known as the Foz do Rio Parafuso — is considered one of the most scenic points within the canyon.

The river meets the Rio Poti amid sandstone walls shaped over geological time, with native caatinga vegetation lining the banks and sections of shade along the margins. The canyon walls are notable for containing ancient petroglyphs, adding a cultural and archaeological dimension to any paddling trip in the area. The sound of rapids and the presence of native birdlife are characteristic of the experience along this stretch.

Paddling is supported at the Foz do Rio Parafuso, with canoes, kayaks, and small local watercraft all appropriate for exploring the confluence area and nearby sections of the Rio Poti. The route allows paddlers to navigate curves in the river, clear pools, and pass beneath rock walls adorned with pre-historic engravings. Access to the area is typically achieved via trails and by river, making the approach itself part of the overall journey through the natural landscape.

The setting is classified as an ecotourism attraction, and the experience combines ecological interest — regional biodiversity, caatinga flora, and wildlife — with cultural significance tied to the ancient populations that once inhabited the canyon. The remote access by trail and river should be factored into trip planning.