The river Corumba has its origin in the proximity of that of the river Almas, not far distant from the Montes Pyreneos. Its course for a vast space describes a large semicircle to the east (where it receives, amongst others, the river St. Bartholomew) as far as the parallel of its source, where the river Peixe is incorporated with it by the right. Thirty miles lower the river Verissimo unites itself with it on the left, after an extensive course, bringing the waters of another called Braco do Verissimo. From hence it flows for a considerable extent, and loses its name on falling into the Parannahiba, which constitutes a boundary for some miles to the province of Minas Geraes as far as the mouth of the river St. Marcos, its northern head, and which makes a similar divisionary line in the opposite direction. Below the embouchure of the Corumba, the Parannahiba is joined by the large river Velhas, the principal head of which is near that of the Andayha, on the borders of Minas Geraes. Many leagues below the mouth of the river Velhas is the confluence of the Parannahiba with the Rio Grande, the limit of the province. In the vicinity of the embouchure of the Velhas, the Parannahiba receives on the right the Annicuns, the most considerable amongst those which unite themselves with it on that side, and has its source in the large wood of Matto Grosso previously mentioned. Almost all the povoaçoes or inhabited places of this province already existed when it was so created and delivered to the government of the viceroy, Conde d’Arcos; and all of them, excepting those in the southern districts, owe their foundation to the gold sought after upon their sites and surrounding lands. The jurisdiction of the ouvidor extended over the whole province, until the present King, when Prince Regent, by a decree of the 18th of March, 1809, divided it into two comarcas, the new one taking the name of St. Joam das Duas Barras, the other retaining that of the capital. Each of them comprehends eight _julgados_, or divisions, including the district of the capital, the only povoaçao yet enjoying the title of a town. The comarca of Villaboa comprises the following julgados:-- Villaboa Crixa Pilar Meia Ponte St. Luzia St. Cruz Desemboque Araxa. The comarca of St. Joam das Duas Barras the following:-- Porto Real Natividade Conceiçao Arrayas St. Feliz Cavalcante Flores Trahyras.