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Updated: September 15, 2025
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.
In going down the Guainia, or Rio Negro, you pass on the right the Cano Maliapo, and on the left the Canos Dariba and Eny. At five leagues distance, nearly in 1 degree 38 minutes of north latitude, is the island of San Josef.
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.
I heard it called Guainia at Javita, Maroa, and San Carlos. Southey, in his history of Brazil, says expressly that the Rio Negro, in the lower part of its course, is called Guiani, or Curana, by the natives; in the upper part, Ueneya. It is the word Gueneya, instead of Guainia; for the Indians of those countries say indifferently Guaranacua or Ouaranacua, Guarapo or Uarapo.
The banks of the Upper Guainia in general abound much less in fishing-birds than those of Cassiquiare, the Meta, and the Arauca, where ornithologists would find sufficient to enrich immensely the collections of Europe. However, the Indians of these countries, during two periods of the year, feed on birds of passage, which repose in their long migrations on the waters of the Rio Negro.
The temperature of Javita is cooler than that of Maypures, but considerably hotter than that of the Guainia or Rio Negro. The centigrade thermometer kept up in the day to twenty-six or twenty-seven degrees; and in the night to twenty-one degrees. From the 30th of April to the 11th of May, I had not been able to see any star in the meridian so as to determine the latitude of places.
The little group of mountains with which we became acquainted at the sources of the Guainia, is remarkable from its being isolated in the plain that extends to the south-west of the Orinoco. Does this ground, composed probably of primitive rocks, like that which I examined more to the east, contain disseminated gold?
The colouring principle seems to be in little abundance; for I observed that the waters of the Guainia or Rio Negro, when subjected to ebullition, do not become brown like other fluids charged with carburets of hydrogen.
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.
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