[1] It is located between the mountains of Pedra Branca (White Rock) and Mendanha in the northern of the called West Zone of the city, owned and named the XXXIII Administrative Region which encompasses the entire east around the neighborhood.

Realengo still has remnants of rainforest that are home to endangered animals such as the Golden lion tamarin, armadillo, macaw, crowned kinglet, monkey frog, and plants like orchids, bromelias and other flora and fauna.

Inaugurated on October 17, 2009 by Governor Sérgio Cabral Filho, the government spent R$786,000.00 (seven hundred eighty-six reais) in equipment such as water tanks and springs, it also runs a post of Firemen to maintain order in the reserve.

The land grant in what is now the Realengo neighborhood, center and periphery, was intended to serve only for grazing cattle, supplying meat to butchers in the city.

The village of Realengo was limited by the Senate of Rio de Janeiro, by the provision of July 18, 1814, taking over the Court of the lands tested on the Estrada da Santa Cruz (Road of Saint Cross) and depths of more than twenty fathoms.

Despite the express prohibition of lease, sale or other disposition, the Senate, after a certain time, taking advantage of the charter of June 27 has all land granted for such reasons that in addition to the ordinance November 20, 1815 the Prince Regent known as royal notice, on December 20, 1815 that allowed only the tenure of the party which was tested on the Estrada de Santa Cruz (and depths of 20 fathoms the maximum, not at all Realengo).