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Updated: June 27, 2025


Near the watershed between the Juruena and the Gy-Parana he established his farthest station to the westward, named Jose Bonofacio, after one of the chief republican patriots of Brazil.

He and his assistants explored, and mapped for the first time, the Juruena and the Gy-Parana, two important affluents of the Tapajos and the Madeira respectively. The Tapajos and the Madeira, like the Orinoco and Rio Negro, have been highways of travel for a couple of centuries.

On the chance Colonel Rondon had directed one of his subordinate officers, Lieutenant Pyrineus, to try to meet us, with boats and provisions, by ascending the Aripuanan to the point of entry of its first big affluent. This was the course followed when Amilcar had been directed to try to meet the explorers who in 1909 came down the Gy-Parana.

The river might bend sharply to the west and enter the Gy-Parana high up or low down, or go north to the Madeira, or bend eastward and enter the Tapajos, or fall into the Canuma and finally through one of its mouths enter the Amazon direct. Lyra inclined to the first, and Colonel Rondon to the second, of these propositions.

He had made good collections of mammals and birds on the Gy-Parana, the Madeira, and in the neighborhood of Manaos; his entire collection of mammals was really noteworthy. Among them was the only sloth any of us had seen on the trip. The most interesting of the birds he had seen was the hoatzin. This is a most curious bird of very archaic type.

On February 27, 1914, shortly after midday, we started down the River of Doubt into the unknown. We were quite uncertain whether after a week we should find ourselves in the Gy-Parana, or after six weeks in the Madeira, or after three months we knew not where. That was why the river was rightly christened the Duvida.

We could not even hazard a guess at what was in front. The river was now a really big river, and it seemed impossible that it could flow either into the Gy-Parana or the Tapajos. It was possible that it went into the Canuma, a big affluent of the Madeira low down, and next to the Tapajos.

We were only some six miles from our place of embarkation on the Duvida, and we divided our party and our belongings. Amilcar, Miller, Mello, and Oliveira were to march three days to the Gy-Parana, and then descend it, and continue down the Madeira to Manaos.

The food cases described above were used on Colonel Roosevelt's descent of the Rio da Duvida and also by the party who journeyed down the Gy-Parana and Madeira Rivers.

Meanwhile Amilcar had ascended the Jacyparana a month or two previously with provisions to meet them; for at that time the maps incorrectly treated this river as larger, instead of smaller, than the Gy-Parana, which they were in fact descending; and Colonel Rondon had supposed that they were going down the former stream. Amilcar returned after himself suffering much hardship and danger.

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