Fitzcarraldo explores entering the rubber business. A helpful rubber baron points out on a map the only remaining unclaimed parcel in the area. He explains that while it is located on the Ucayali River, a major tributary of the Amazon, it is cut off from the Amazon (and access to Atlantic ports) by a lengthy section of rapids. Fitzcarraldo sees that the Pachitea River, another Amazon tributary, comes within several hundred meters of the Ucayali upstream of the parcel. He plans to investigate that.