the rio dos macacos (monkey river), which gets its name from the abundance of native wildlife that lives in the surrounding tijuca forest - particularly the many small monkey species that are typical for the region.

it  is located inside the tijuca national park, flowing through the neighborhood of jardim botânico behind the pedra d'agua mountain. it is home to a number of small waterfalls, the most well know of which is the cacheiro dos primatas.