This is the most demanding trail in the reserve and is recommended for visitors used to walking. The trail begins at around 70 metres above sea level, at Casa Pesquisa, following a path that gradually advances before becoming increasingly steep as it enters deeper forest. As the climb continues, the trail passes through one of the best-preserved areas of REGUA, where Southern woolly spider monkeys (Muriquis) and Pumas inhabit. It is also an excellent route for observing a wide range of bird species, particularly in the early morning. The solitary tinamou and blue-bellied parrot can be found on this trail. At its highest point, you can see across the last valley before the mountains of Teresópolis, and also parts of Cachoeiras de Macacu municipality. The vegetation changes noticeably: low, sturdy trees covered in orchids and bromeliads signal the elfin forest, a rare and captivating habitat that gives the trail its name. The trail reaches close to 1,000 metres of altitude, rewarding the effort with cool mountain air and beautiful scenery. The return follows the same path downhill. Visitors are advised to carry plenty of drinking water, as this is a long and demanding walk.