The reserve is located in the mountainous
Serra do Mar region in the
Atlantic Forest biosphere and includes dense submontane tropical rain forest, montane and higher montane forest and alpine pastures. It mostly lies within the municipality of
Petrópolis, with a small part in the municipality of
Miguel Pereira. The area was originally set aside for fruit and wood production, but only 10% was exploited. The remainder is in excellent condition and provides a safe haven for many species typical of the Atlantic Forest of Rio de Janeiro. ==Administration==