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distant horizon, and our first impression made us instantly recall the tabular formation of Piaui.

Tabular mountains on the Amazon

The first plane, the front of the hills, was sparse, with very low islands, where the silvery green was so much more glossy than the waters of the golden Amazon, because it had covered the background of a blue-green colored landscape. Only the mountain to the east, which was lower than the others, reddish stone revealed itself on the slopes; all the others were clothed everywhere in a dense closed forest.

Amazon river, Marajo to Vila Rainha

These mountains, the Serra de Paru, whose isolated branches, called Serra de Almeirim, Vaimi Buraco, Tucumaintuba, Uaramu, Jutai and Parana-coara, extend from Vila de Almeirim to Monte Alegre; they do not, however, form an uninterrupted chain, but they are separated from each other, all the more as one proceeds westward. In general, here seafarers are no longer concerned with high and low tide, so, to the east, they leave Gurupa behind; however, these periodical movements still exert influence on the journey in the channels of Aquiqui.

Rio Xingo meets Rio Aqui Aqui

From there on to the west, the river appeared to us in all its width, about three leagues, not interrupted by any island. The current of the monstrous mass of water, not hindered by any impediments, is more rapid and impetuous. From the rolling of the canoe, it seemed we were on the high seas. The navigation is also dangerous in such spots, because the boats, hitting the rocks, can be broken in pieces by the force of the current. In the old days, for that reason, those who left the mouth of the Aquiqui preferred to sail toward the northern coast, or to stay inside the channel that connects the water course of the Aquiqui with the bifurcation of the Guajara River. This river descends parallel with the Jaraucu to the Amazon, and, before joining the latter, their bifurcations are gathered, in number of four to six, with those of Jaraucu, in a network of canals, by which,

leaving Porto of Moz, a safe but slow and painful navigation is possible because of the many curves

and incessant pursuit of the mosquitoes. This is why sailors prefer to travel on their own, along the coast, making the trip in three days, while five days are spent on the canals. We almost had to regret not choosing this safer route, for two days of continuous toiling with our equipment carried us only about eight leagues west because the east wind was blowing very weakly; and when, on the night of the 14th to the 15th of September the northeast wind did not reach us, we sailed faster upriver, until the roaring of the rowers at the bow frightened us. Thus, they informed us that we were about to hit bottom in an arm and a half of water. The night was dark, with no stars and we were besieged by