crux ecoaventuras offers guided tours in several of the caves of the tijuca forest, and can be contacted via this page, via email on this link, or via phone by calling 21 3322.8765 / 3474.1726.

cs tur  is one of the companies in rio de janeiro specializing in eco-tourism in rio's caves, publishing more information on the circuito das grutas (complexo espeleológico do archer) and contact forms on this page.

published by projeto caminhos geológicos, on this page is a map of the most important geological locations in the state of rio de janeiro (mapa de localização dos pontos de interesse geológico do estado do rio de janeiro).