A little further to the north, the abundant river Tabocas disembogues by the left, having its heads near the serra of Estrondo. One hundred and forty miles to the north of the said river Manuel Alvez, also by the eastern margin, the Somno (Sleep) adds its abundant waters; and, after a little farther distance, the other Manuel Alvez discharges itself, being larger than the first, and serves, up to the present period, as the northern limit of the eastern portion of the province. Both those rivers flow from the boundary, traversing a territory inhabited by malevolent Indians. A party proceeded up the first, with the intention of exploring its margins and extent, under the influence of such an unpropitious star that they were never more heard of; from which circumstance the river received the name by which it is designated. A few miles below the Manuel Alvez (the northern) the Tucantines describes a considerable winding towards the east, almost circular, again approximating very near to the place where it had on a sudden changed its direction, and immediately describing another contrary winding to the west, forming two peninsulas, the first of a circular figure, and the other in the form of an oval. About one hundred miles further, in the latitude of six degrees, the Araguaya incorporates itself with the Tucantines on the left, rendering it exceedingly voluminous and grand, still continuing to flow northward, describing fewer windings and becoming gradually larger. When it passes the town of Cameta, in about 3° latitude, its width is already more than ten miles. The tide flows up this river more than two hundred miles, nearly to the situation denominated Itaboca, which literally means “perforated stone,” where the river is precipitated, in a short space, over three falls, which compel the navigator to unload his canoes. One hundred miles is computed between the mouths of the Araguaya and Itaboca, and from thence to Cameta one hundred and twenty. The _paratinga_, not less than eight feet in length, with proportionate circumference, and the _jahu_, are the largest fish of the High Tucantines, which is not considered to abound in any species of fish.