boat: smaller watercraft

Amazon rainforest: large rainforest in South America

cargo ship: ship that carries cargo, goods, and materials onboard from one port to another

river: larger natural watercourse

Porto Velho: the capital of the Brazilian state of Rondônia, in the upper Amazon River basin

wharf: structure on the shore of a harbor or on the bank of a river or canal where ships dock

Madeira River: river in Bolivia and Brazil

railway: interconnected network of infrastructure and vehicles used for train rail transport