Trombetas
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The Trombetas is the first river of importance we meet on the northern side as we ascend the Amazon River. Its confluence with this is just above the town of Obidos. It has its sources in the Guiana highlands, but its long course is frequently interrupted by violent currents, rocky barriers, and rapids. The inferior zone of the river, as far up as the first fall, the Porteira, has but little broken water and is low and swampy; but above the long series of cataracts and rapids the character and aspect of the valley completely change, and the climate is much better. The river is navigable for 135 miles above its mouth.
This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.
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