The Maranon, on having burst through the defile of the Pongo de Man seriche (575 ft.
Thence to the Huallaga the elevation of the land is somewhat greater; but not until this river is passed, and the Pongo de Manseriche approached, does the swelling ground of the Andean foot-hills raise the country above flood-level.
Pataz, Huanuco, Chuquitambo, Huancavelica, Cuzco, Cotabambas, Aymares, Paucartambo, Santo Domingo and Sandia; the latter wholly on the Amazon slope, in the country about the Pongo de Manseriche and at Chuquibamba, both on the upper Maranon, in the districts of Pataz, Huanuco, Aymares and Antabamba (Apurimac), Paucartambo and Quippicauchi (Cuzco), and Sandia and Carabaya (Puno).
From this appears that Battel was familiar with both the chimpanzee and the gorilla, the former of which he terms engeco and the latter pongo - names which ought apparently to be adopted for these two species in place of those now in use.
The Pongo de Manseriche, at the base of the Andes and the head of useful navigation, seems to be the natural terminus of the Maranon; and an examination of the hydrographic conditions of the great valley makes the convenience and accuracy of this apparent.
The Pongo de Manseriche was first discovered by the Adelantado Joan de Salinas.
The great rivers of the sierra are the Maranon, rising in the lake of Lauricocha and flowing northward in a deep gorge between the Maritime and Central Cordilleras for 350 m., when it forces its way through the mountains at the famous Pongo de Manseriche and enters the Amazonian plain.
Later, the missionaries of Cuenca and Quito established many missions in the Pais de los Maynas, and made extensive use of the Pongo de Manseriche as an avenue of communication with their several convents on the Andean plateau.