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Updated: June 29, 2025
We had already travelled one hundred and eighty leagues in a boat from San Fernando de Apure to San Carlos, on the Rio Apure, the Orinoco, the Atabapo, the Temi, the Tuamini, and the Rio Negro. In again entering the Orinoco by the Cassiquiare we had to navigate three hundred and twenty leagues, from San Carlos to Angostura.
M. Bonpland was losing by this excessive humidity the plants he had collected; and I, for my part, was afraid lest I should again find the fogs of the Rio Negro in the valley of the Cassiquiare.
In proportion as we draw near to an object we have long had in view, its interest seems to augment. The uninhabited banks of the Cassiquiare, covered with forests, without memorials of times past, then occupied my imagination, as do now the banks of the Euphrates, or the Oxus, celebrated in the annals of civilized nations.
Granite predominates there over the other rocks; and though, in both continents, the granite of ancient formation is pretty generally destitute of gold-ore, we cannot thence conclude that the granite of Parima contains no vein, no stratum of auriferous quartz. On the east of the Cassiquiare towards the sources of the Orinoco, we observed that the number of these strata and these veins increased.
Nor is it more probable, that the discovery of sea-shells on the summit of mountains gave birth, among the nations of the Orinoco, to the tradition of some great inundation which extinguished for a time the germs of organic life on our globe. The country that extends from the right bank of the Orinoco to the Cassiquiare and the Rio Negro, is a country of primitive rocks.
This observation made known to us at the same time, with sufficient precision for the purposes of geography, the positions of the mouth of the Pacimoni, of the fortress of San Carlos, and of the junction of the Cassiquiare with the Rio Negro. The rock of Culimacari is precisely in latitude 2 degrees 0 minutes 42 seconds, and probably in longitude 69 degrees 33 minutes 50 seconds.
I mention this circumstance to prove how difficult, within the tropics, on the banks of great rivers, are the first attempts of man to appropriate to himself a little spot of earth in that vast domain of nature, invaded by animals, and covered by spontaneous plants. During the night of the 13th of May, I obtained some observations of the stars, unfortunately the last at the Cassiquiare.
Each of those regions includes from seven to eight thousand square leagues; further south, between the delta of the Orinoco, the Cassiquiare and the Rio Negro, lies a vast extent of land as large as France, inhabited by hunting nations, covered with thick forests and impassable swamps.
The Cassiquiare alone has cut its way across the ridge just described. In that part of the basin of the Orinoco which runs in the direction of from south to north, as well as in that running from west to east, the maxima of depression are found at the foot of the Sierra Parime, we may even say, on its outline. This is the central and largest basin of South America.
What I saw of this country between the second and eighth degrees of latitude, and the sixty-sixth and seventy-first degrees of longitude, is entirely composed of granite, and of a gneiss passing into micaceous and talcous slate. These rocks appear naked in the lofty mountains of Parima, as well as in the plains of the Atabapo and the Cassiquiare.
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