Hereabouts are a few waterfalls, were it not for which the river would be navigable from its mouth to its source.

As it is, however, according the Humboldt, the Amazon is free for five-sixths of its length.
And from its first starting there is no lack of tributaries, which are themselves fed by subsidiary streams.

There is the Chinchipa, coming from the northeast, on its left.

On its right it is joined by the Chachapoyas, coming from the northeast.

On the left we have the Marona and the Pastuca; and the Guallaga comes in from the right near the mission station of Laguna.