It is joined by the Ucayali, a great navigable river with a course of 600 m.
The country between the Huallaga and the Ucayali, traversed by the Eastern Cordillera, is called the Pampa del Sacramento, and is characterized by extensive grassy plains.
The forests drained by the Maranon, Huallaga and Ucayali form the northern portion of the Peruvian montana.
Surveys were completed in 1909 for an extension of the Oroya line from a point on its Cerro de Pasco branch eastward to the Ucayali, and another transandean line frequently discussed is projected from Paita across the Andes to Puerto Limon, on the Maranon-a distance of 410 m.
The rivers forming this system are the Maranon from Puerto Limon to Tabatinga on the Brazilian frontier (484 m.), the Japura, Putumayo, Javary, Napo, Tigre, Huallaga, Ucayali, Pachitea, Jurua, Purus, Acre, Curaray and Aguarico all navigable over parts of their courses for steamers of 4 to 8 f t.
From Puerto Bermudez, on the Pachitea or Pichis river, the terminus of a government road and telegraph line, a wireless system connects with Massisea on the Ucayali, and thence with Iquitos, on the Maranon-a distance of 930 m.
Del Fuego; Paniquitan, Colombia; Panoan, Ucayali R., Peru; Payaguan, Chaco; Puquinan, Titicaca L.; Samucan, Bolivia; Tacanan, N.
Below the mouth of the Ucayali and 930 m.
The city has a large import and export trade for an immense region watered by the Maranon, Huallaga, Ucayali and other large Amazonian rivers navigated from Iquitos by lines of small boats.
Raimondi terminates the Maranon at the mouth of the Ucayali, Reclus the same, both following the missionary fathers of the colonial period.
The former accepted the name Maranon in Peru, and as the missionaries penetrated the valley they extended the name until they reached the mouth of the Ucayali; while, as the Portuguese ascended the Amazon, they carried this name to the extent of their explorations.
The Peruvian government has sought to open a trade route between the Rio Ucayali and the rich rubber districts of the Mayutata.
It runs through a continuous forest at the bottom of the great depression lying between the Madeira river, which skirts the edge of the Brazilian sandstone plateau, and the Ucayali which hugs the base of the Andes.
It rises among the Ucayali highlands, and is navigable and unobstructed for a distance of 1133 m.
Above its mouth to its sources among the Ucayali highlands, but only 260 have been found suitable for steam navigation.
The Ucayali, which rises only about 70 m.
The Ucayali was first called the San Miguel, then the Ucayali, Ucayare, Poro, Apu-Poro, Cocama and Rio de Cuzco.
The confluence of the Ucayali with the Amazon.
The " Napo " then succeeded in ascending the Urubamba branch of the Ucayali 35 m.
Senor Torres, who explored the Alto Ucayali for the Peruvian government, gives it a length of 186 m., counting from the mouth of the Pachitea to the junction of the Tambo and Urubamba.
The banks of the Ucayali for Soo m.
The Huallaga (also known as the Guallaga and Rio de los Motilones), which joins the Amazon to the west of the Ucayali, rises high among the mountains, in about 1 o° 40' S.
Between the Huallaga and the Ucayali lies the famous " Pampa del Sacramento," a level region of stoneless alluvial lands covered with thick, dark forests, first entered by the missionaries in 1726.
Many streams, navigable for canoes, penetrate this region from the Ucayali and the Huallaga.
West of the junction of the Ucayali with the Amazon.
From the latter river, however, to the Ucayali, a distance of nearly 150o m., the forested banks are just out of water, and are inundated long before the river attains its maximum flood-line.