canoe: light boat that is paddled

rope: long, flexible, and strong object, usually round in shape, made of threads, strands, or filaments twisted or braided together

Amazon rainforest: large rainforest in South America

group of humans: any set of human beings

river: larger natural watercourse

natural rubber: polymers of the organic compound isoprene, with minor impurities of other organic compounds; refined from latex harvested from rubber trees

Madeira River: river in Bolivia and Brazil

worker: person who works