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Updated: June 7, 2025
We left the mission at a late hour in the morning, and continued to go up the Atabapo for five miles; then, instead of following that river to its source in the east, where it bears the name of Atacavi, we entered the Rio Temi.
When the least breath of wind agitates the surface of these black rivers they appear of a fine grass-green, like the lakes of Switzerland. In the shade, the Zama, the Atabapo, and the Guainia, are as dark as coffee-grounds. These phenomena are so striking, that the Indians everywhere distinguish the waters by the terms black and white.
Notwithstanding the privations to which we were exposed during our excursions in the Cordilleras, the navigation from Mandavaca to Esmeralda has always appeared to us the most painful part of our travels in America. I advise those who are not very desirous of seeing the great bifurcation of the Orinoco, to take the way of the Atabapo in preference to that of the Cassiquiare.
The inundations of the rivers forced her to go far from the banks of the main stream, through the midst of woods where the movement of the water is almost imperceptible. How often must she have been stopped by the thorny lianas, that form a network around the trunks they entwine! How often must she have swum across the rivulets that run into the Atabapo!
At the mouth of the Rio Zama we approach a class of rivers, that merits great attention. The Zama, the Mataveni, the Atabapo, the Tuamini, the Temi, and the Guainia, are aguas negras, that is, their waters, seen in a large body, appear brown like coffee, or of a greenish black. These waters, notwithstanding, are most beautiful, clear, and agreeable to the taste.
The latter plains, however, furnish some ledges of fragmentary rocks on the south-west of San Fernando de Atabapo, as well as on the south-east, in the lower part of the Rio Negro and the Rio Branco. I saw in the plains of Jaen de Bracamoros a sandstone which alternates with ledges of sand and conglomerate nodules of porphyry and Lydian stone.
I think this lowering of the temperature may be attributed to the river being less broad, and without the sandy beach, the heat of which, at the Orinoco, is by day more than 50 degrees, and also to the thick shade of the forests which are traversed by the Atabapo, the Temi, the Tuamini, and the Guainia, or Rio Negro.
At 4 degrees 20 minutes it stretches from the right bank of the Orinoco toward the east and east-south-east. The whole of the land extending from the mountains of the Parima towards the river Amazon, which is traversed by the Atabapo, the Cassiquiare, and the Rio Negro, is an immense plain, covered partly with forests, and partly with grass. Small rocks rise here and there like castles.
What would lead me to doubt this last supposition is, that we saw toninas above the great cataracts of the Orinoco, in the Rio Atabapo. Did they penetrate into the centre of equinoctial America from the mouth of the Amazon, by the communication of that river with the Rio Negro, the Cassiquiare, and the Orinoco?
On leaving Spain, I had promised to rejoin the expedition wherever I could reach it. M. Bonpland and I resolved instantly to divide our herbals into three portions, to avoid exposing to the risks of a long voyage the objects we had obtained with so much difficulty on the banks of the Orinoco, the Atabapo and the Rio Negro.
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