On the left there comes the Chambyra and the Tigre, flowing from the northeast; and on the right the Huallaga, which joins the main stream twenty-eight hundred miles from the Atlantic, and can be ascended by steamboats for over two hundred miles into the very heart of Peru.

To the right, again, near the mission of San Joachim d'Omaguas, just where the upper basin terminates, and after flowing majestically across the pampas of Sacramento, it receives the magnificent Ucayali, the great artery which, fed by numerous affluents, descends from Lake Chucuito, in the northeast of Arica.
Such are the principal branches above the village of Iquitos.

Down the stream the tributaries become so considerable that the beds of most European rivers would fail to contain them.

But the mouths of these auxiliary waters Joam Garral and his people will pass as they journey down the Amazon.
To the beauties of this unrivaled river, which waters the finest country in the world, and keeps along its whole course at a few degrees to the south of the equator, there is to be added another quality, possessed by neither the Nile, the Mississippi, nor the Livingstone--or, in other words, the old Congo-Zaira-Lualaba--and that is (although some ill-informed travelers have stated to the contrary) that the Amazon crosses a most healthy part of South America.

Its basin is constantly swept by westerly winds.