The Huallaga River is a tributary of the Marañón River, part of the Amazon Basin. Old names for this river include Guallaga and Rio de los Motilones. The Huallaga is born on the slopes of the Andes in central Peru and joins the Marañón before the latter reaches the Ucayali River to form the Amazon. Its main affluents are the Monzón, Mayo, Biabo, Abiseo and Tocache rivers. Coca is grown in most of those valleys, which are also exposed to periodic floods.
Cerro Azul District is one of sixteen districts of the province Cañete in Peru.
Nuevo Imperial District is one of sixteen districts of the province Cañete in Peru.
San Antonio District is one of sixteen districts of the province Cañete in Peru.
Santa Cruz de Flores District is one of sixteen districts of the province Cañete in Peru.
Mariatana District is one of thirty-two districts of the province Huarochirí in Peru.
Santa Cruz de Cocachacra District is one of thirty-two districts of the Huarochirí Province, located in the Department of Lima in Peru. The district was created by the Law No. 13261 in October 29, 1959, during the second presidency of Manuel Prado Ugarteche.
Santo Domingo de los Olleros District is one of thirty-two districts of the province Huarochirí in Peru.
Pachangara District is one of six districts of the province Oyón in Peru.
Huañec District is one of thirty-three districts of the province Yauyos in Peru.
Quinocay District is one of thirty-three districts of the province Yauyos in Peru.
Arahuay District is one of seven districts of the province Canta in Peru.
Atavillos Bajo District is one of twelve districts of the province Huaral in Peru.
Pinra District is one of four districts of the province Huacaybamba in Peru.
Nuevo Progreso District is one of five districts of the province Tocache in Peru.
Uchiza District is one of five districts of the province Tocache in Peru.
Shunte District is one of five districts of the province Tocache in Peru.
José Crespo y Castillo District is one of six districts of the province Leoncio Prado in Peru.
Huacchis District is one of sixteen districts of the Huari Province in Peru.
Tocache is a town in Northern Peru, capital of the province Tocache in the region San Martín. There were 23,511 inhabitants according to the 2007 census.
Peru 
