on this link, we listed a technical definition of the most important types of conservation units (unidade de conservação) and protected areas in rio de janeiro.     

a type of ecological reserve, called ecological station (estações ecológicas), has access restricted for educational and scientific reasons only.  

for the reserves located in rio, the institudo estadual do ambiente - inea, posts on this page an orientation and instructions on how to get access to these protected areas, including a link to the document to be filled out and submitted (documentos para solicitação de autorização de pesquisa).

visitors interested in entering this or other areas of environmental protection, wild beaches, or any other region where nature is more present than humans, should read the rules of conduct, as prepared by the ministry of the environment of brazil and posted on this page.