A few large streams enter the lower Apure from the south, but they are frequently entangled in lateral canals, due to the slight elevation of the plains above sea-level, the waters of the Apure, especially during flood time, having opened a great number of canos before reaching the Orinoco.
In floods, unable to carry the additional water contributed by the Sarare, it overflows its banks, and by several canos gives its surplus to the Capanaparo, which, about 18 m.
En route to the gulf the Vagre sends across the delta, east and north, two canos or canals of considerable volume, called the Macareo and Cuscuino.
Near its mouth, the Xingu expands into an immense lake, and its waters then mingle with those of the Amazon through a labyrinth of canos (natural canals), winding in countless directions through a wooded archipelago.
From its Coca branch to the mouth of the Curaray the Napo is full of snags and shelving sandbanks, and throws out numerous canos among jungle-tangled islands, which in the wet season are flooded, giving the river an immense width.
It belongs entirely to the lowlands, and is very crooked, has a slow current and divides much into canos and strings of lagoons which flood the flat, low areas of country on either side.