He became established as a rubber baron in the late 19th century. Determined to find a way to transport rubber out of the Madre de Dios region, he exploited native workers. He forced them under pain of death to dismantle and transport a ship over a mountain during the early 20th-century rubber boom in the Amazon Basin.
He explored the Madre de Dios region of BAP Fitzcarrald in Lake Sandoval, Madre de Dios, Peru. He founded the City of Puerto Maldonado and explored the area that is now the Manu Biosphere Reserve. To achieve this, it was necessary to transport his steam ship piece by piece over the mountains to the Madre de Dios basin. 
Fitzcarrald discovered a short passage overland between the Mishagua River, a tributary of the Urubamba, and the Manu, a tributary of the Madre de Dios River. The latter leads into the Ucayali River. The Isthmus of Fitzcarrald was later named for him, as discovery of this route enabled transport of rubber from the Madre de Dios region. It was transferred to ships on the Manu, which could reach the Madre de Dios, the Ucayali River and thereby down the Amazon to markets and Atlantic ports for export.
- The Carlos Fermín Fitzcarrald Province was named after him.
- Puerto Maldonado has a place to view the sunken remains of Fitzcarrald's steam ship, the Contamana, which is located in the Madre de Dios River.
- The film Fitzcarraldo (1982) was inspired by his efforts, symbolizing the extremes generated during the rubber boom.
- Sevillano, Alfonso Cueva (2004). "Carlos Fermin Fitzcarrald". Diccionario histórico biográfico: peruanos ilustres (in Spanish) (A.F.A. Editores Importadores). p. 222.
- Dan James Pantone, PhD., "The Myth of Fitzcarraldo", Iquitos News and Travel, 2004-2006
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