Note: Do not rely on this information. It is very old.
Japura, or Caqueta, a tributary of the Amazon, has its source in the Colombian Andes, about 25 miles from the town of Mocoa, Colombia, and after a south-easterly course of some 700 miles, during which it skirts the N.E. boundary of Ecuador and enters Brazil, it joins other tributaries near San Antonio de Maripi, previously to their entering the mother stream some 100 miles further south. It is navigable for about 500 miles.