1st. Rio de Chimalapa, sometimes called also, Rio de Chicapa, rises in the forests and mountains of Tarifa in about 16° 43´ north, 96° 33´ west from Paris, and debouches in the Pacific, after passing the village of Tehuantepec. The rivers Obstula, Niltepec or Estepec,—de los Perros or Juchuitan, Arenas, Lagartero, Otates, are small coast streams falling into the lagunes that border the ocean.
2d. The Rio de Tehuantepec is formed by the union of two streams, one of which rises about fifty leagues west north-west of Tehuantepec, near the village of San Dionisio, whilst the other springs from the mountains of Lyapi and Quiégolani, in the lands of the Chontales. The two unite seven leagues north-west of Tehuantepec; and, passing by the village of that name, this river finally pours into the Pacific, near the small port of Las Ventosas.
3d. The Rio Verde rises in the Upper Misteca, eight leagues north of Oajaca, and falls west of the Cerro de la Plata and of the Lagunas of Chacahua, into the Pacific. On the coast of Oajaca there are many smaller streams and rivulets, such as the Chacalapa, the Manialtepec, the Colotepec, the Santa Helena, the Caputita, the Comun, the Ayutla, the Chicometepec and the Tecoyama,—the last of which is the boundary between the states of Oajaca and Puebla.
4th. The Rio de Tlascala, or Rio de Papagallo, has its source in the vicinity of the town of Tlascala, in the mountain Atlancatepetl; passes through the state of Puebla, receives the Rio Mezcala, out of the state of Mexico, and enters the Pacific south of the village of Ayulta.
5th. The Rio de Zacatula, or Rio Balsas, originates in the valley of Istla, in the state of Mexico, and after winding west south-westerly, it receives the Rios Zitacuaro, de Churumuco, and del Marquez out of the state of Michoacan, and passes into the Pacific.
6th. Rio de Aztala rises two leagues south-west of the village of Coalcoman, receives the Agamilco, Maruato and Chichucua, and flows into the sea between Cachan and Chocóla.
7th. Rio de Tolotlan, Rio Grande de Santiago. This is one of the longest and most important of Mexican rivers, formed by the junction of the Laxa and Lerma, near Salamanca, in the state of Guanajuato, and falls into the Pacific near San Blas after a course of about two hundred leagues. The Rio Bayóna or Cañas is an important stream on the coast near the boundary between Jalisco and Sinaloa.
8th. The Rio de Culiacan rises in the north of the state of Durango, where it is called Rio Sanzeda, thence it takes its course towards the north-west, receiving some smaller streams, and then passing by the town of Culiacan, falls into the Gulf of California. The Rio de Rosario, Rio de Mazatlan, debouche in the same gulf. The rivers Piastla, Elota, Tavala, Emaya, Mocorito, Sinaloa or Ocroni, Ahome, are small streams on the coast of Sinaloa.
9th. The Rio del Fuerte has its source in the metalliferous mountains of Batopilas and Uruachi, in the state of Chihuahua, where it is known as the river Batopilas. It takes a westerly course across the state of Sinaloa about 27° north;—it receives a number of other streams, on the western slope of a range of the Cordilleras, and finally flows into the California Gulf.
10th. The Rio Mayo is the boundary stream between the states of Sinaloa and Sonora; at its mouth in the Gulf of California is the small port of Santa Cruz de Mayo, or Guitivis.