Rafts were used to transport goods downstream. The rafts were made of a log platform on top of inflated animal skins.
When the raft arrived at the port, the goods on board were unloaded and sold. The raft was taken apart and the logs used to make it was sold. The animal skins were deflated and loaded onto donkeys to be carried back to the merchant's home city.
Click on the raft to see what is being carried