The Rio dos Cedros is a rocky whitewater river in the Vale do Itajaí region of Santa Catarina, Brazil, draining a large watershed that keeps it flowing reliably through most of the year. The river offers multiple distinct sections ranging from Class 3+ to Class 5+, making it a destination primarily suited to experienced and expert paddlers.

The uppermost documented section begins at a dam (put-in GPS: -26.655205, -49.350480) and runs to a power station (take-out GPS: -26.661302, -49.333097). Rated Class 5+, this stretch is typically dewatered due to dam operations and features an auto-boof park and huck at the dam structure, with the remainder a sieve pile — a serious hazard requiring careful assessment before attempting.

Immediately downstream, a Class 5 section runs from a historic bridge (put-in GPS: -26.672413, -49.321298) to a small footbridge (take-out GPS: -26.672479, -49.320826) — a very short stretch. This section contains one massive sieve that is usually portaged river right, along with two boulder garden rapids. The historic bridge also serves as a landmark, with a kayak bar located just upstream.

A lower Class 3+ section puts in at the small footbridge (-26.684112, -49.313533) and takes out at a private, kayaker-owned farm (-26.701225, -49.287495). This stretch serves as a suitable warm-up run for the river's upper sections, or a cool-down after them, and reflects the river's generally rocky character throughout.

The gauge for the Rio dos Cedros is offline, so flow assessment relies on visual inspection. Given the large watershed, the river typically flows year-round. Paddlers should be aware that sieves are a recurring hazard on this river, particularly on the upper sections. The take-out for the lower section is on private property belonging to a kayaker, so access arrangements should be confirmed in advance.