trilhas rj specializes in hiking and spelunking tours, and can be contacted via this online form, or by calling (21) 3437-1056

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).