Oposura, Sonora and Dolores are found in the neighborhood of this mountain country.
Sonora is divided into two Departments:
1st. The Department of Arispe, with three cantons, viz: Arispe, Oposura and Altar.
2nd. The Department of Horcasitas, with three cantons, viz: Horcasitas, Ostimuri, and Petic.
The chief rivers are the Mayo, the boundary in the direction of Sinaloa; the Yaqui or Hiaqui; the Rio Grande de Bavispe; Oposura; Sonora; Dolores; Guayamas; Rio de la Ascencion; San Ignacio; Gila; San Francisco or Rio Azul; San Pedro; Santa Maria and the Rio Colorado.
The climate of Sonora is warm throughout the year; but the early spring is subject to remarkable and rapid changes of temperature, and to sudden variations of wind between the north and east. From April to the end of September the thermometer ranges between 75° and 84° Fahrenheit.
A large portion of Sonora is occupied by Indian tribes, some of which are partially agricultural where they have been brought into contact with the whites; but the greater portion may be regarded as belonging to the wild nomadic bands which have hitherto harassed the northern settlements of Mexico. In the eastern part of the State, on the banks of the Sonora and Oposura, and in the vicinity of the town of Arispe and the mineral region of Nocasari, we find large numbers of the Opátas. North of the Ascencion, and stretching far inland from the coast, are the Pimos Altos, the most northerly bands that have submitted to the influences of Christianity or of partial civilization. The nomadic tribes in the north and north-east of the State are Papayos or Papábi-Otawas, the Yumas, the Cucapas or Cupachas, the Cajuenches, the Coanópas, the