The river Colorado is the principal river of the uncolonized country north of Pimeria. This river has been also called Rio Colorado de los Martyres. The course of the Colorado may be computed in a straight line at 200 leagues, or 600 miles, and it is generally from north-east to south-west. It is called Colorado, or coloured, from the water being tinged red by the clay of its banks. This river rises in the Sierra Verde, it is navigable for a considerable distance, and very deep where it is joined by the Rio Gila, which issues from the same mountains in Pimeria, further to the south. This latter river, though broad and large, has no depth, and the country which lies between these streams is a desert of high land, without water or grass. The savages who inhabit the northern side of the Colorado, are termed Cocomaricopas, and are celebrated for their dexterity in swimming the river with a piece of wood in their left hand to support their goods and weapons above the water, and steering with their right, the women carrying their infants on a basket work attached to their bodies. Their side of the river is fertile, and they are an industrious people. The Colorado meets many other rivers which rise in the same chain; the chief of these is the Zaguananas, which rises in those mountains, in about 40° north latitude. There is a large lake near this branch, called Buenara, in 39° north latitude, on the frontier, but of this lake nothing certain is known. The Colorado empties itself by an immense estuary into the northern part of the gulf of California. The Rio Gila is the next river of importance of this country, but both this and the Rio Colorado are north of the actual intendancy of Sonora. There are several rivers in Pimeria, but so imperfect are the accounts relative to this province, that nothing can be advanced with certainty about them. The Rio Ascension is the chief, on whose banks live a tribe of warlike Indians, named Seris. Higher Pimeria contains the fort of Ternate and Lower Pimeria, the fort of Buenavista. The province contains much gold in grains, but it is not sought after, owing to many causes, amongst which the incursions of the warlike Indians of the neighbouring country is the principal one. SONORA. SONORA is the next province in proceeding southward, but, as in all this part of the New World, its limits are not accurately defined; it is however bounded by Pimeria on the north, the gulf of California and Hiaqui on the west, New Biscay on the east, and Hiaqui on the south. It is about 420 miles in length in a northerly direction, and 380 in breadth, from west to east. The soil of Sonora is good on the shore of the gulf, and very fertile, but no very extensive forests are found in this province. The climate is good, the air being reckoned very pure; but on the immediate vicinity of the gulf, the air is indeed impregnated with marshy effluvia, and therefore not so conducive to health as in the interior.