"Definite proposals were at that time formulated by which the Gambia was to be exchanged for all posts by France between the Rio Pongas (Pongo river, French Guinea) and the Gabun.
It has forty-two rapids, its last obstruction being the Pongo de Aguirre, so called from the traitor Aguirre who passed there.
Lat.; then it makes a great bend to the north-east, and with irresistible power cuts through the inland Andes, until at the Pongo de Manseriche 2 it victoriously breaks away from the mountains to flow onwards through the plains under the name of the Amazon.
But the last barrier has yet to be passed, the Pongo de Manseriche, 3 m.
According to Captain Carbajal, who descended it in the little 2 Pongo is a corruption of the Quichua puncu and the Aymara ponco, meaning a door.