This comarca is very little known by the Portuguese, and is in the power of various barbarous nations. The _Pammas_, who possess a considerable portion upon the Madeira, are of a white complexion. The _Tamares_ are masters of the adjacencies of the river Juyna, the first notable branch of those which enlarge the Juruenna by the western bank. The _Paccahas_ live to the north of the latter. The _Sarummas_ farther to the north, along the margins of the said Juruenna. And, lower down, the _Uhaihas_. The Juruenna, which is said to take the name of a nation, has its origin a little to the north of the Jauru. Its course is directed to the north, and it incorporates by two mouths with the Arinos, between the parallel of 9° and 10°. Its large volume of water, more considerable than the river which receives it, shows that it is joined by numerous other streams in its course. Hitherto, it has not been navigated by Christians; those who have examined it at the mouths state, that its waters are particularly clear, and that various islands are situated in that portion of its bed within view. It is discharged between two _serrotes_, or hills, of trifling elevation. The island separating its two mouths is of medium size and moderate altitude. The Jamari, and the Giparanna, are the largest rivers flowing from this comarca into the Madeira. The first rises on the northern skirts of the serra Paricis, in the territory of the Guaritere Indians, where it is called the Candeas, waters the lands of the Camarares, who afford their name to one of its principal arms, and discharges fifty miles below the fall of St. Antonio. It is said to have a cataract two days’ voyage above its mouth, and to flow through auriferous lands. The Giparanna, also called Machado, has its source to the east of the Jamari, also in the skirt of a branch of the same serra, and soon begins to be enlarged by small streams, that irrigate the territories of savage tribes, and falls into the Madeira, nearly thirty miles below the preceding. In its vicinity there is sarsaparilla, and the cocoa tree, from which chocolate is made. Eight miles below the mouth of the Jamari is an outlet of the lake Tucunare, little removed from the margin of the Madeira. The river Soteiro and the Pacanova descend from the southern side of the said serra Paricis, and fall into the Guapore, the Soteiro forty miles below the Ubahi, and the Pacanova seventy miles further.