The Ene River is a Peru

Peru

Peru , officially the Republic of Peru , is a country in western South America. It is bordered on the north by Ecuador and Colombia, on the east by Brazil, on the southeast by Bolivia, on the south by Chile, and on the west by the Pacific Ocean....

vian river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 on the eastern slopes of the South America

South America

South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

n Andes

Andes

The Andes is the world's longest continental mountain range. It is a continual range of highlands along the western coast of South America. This range is about long, about to wide , and of an average height of about .Along its length, the Andes is split into several ranges, which are separated...

.

The Río Ene is part of the headwaters of the Amazon River

Amazon River

The Amazon of South America is the second longest river in the world and by far the largest by waterflow with an average discharge greater than the next seven largest rivers combined...

 whose origin is at the Nevado Mismi

Nevado Mismi

Nevado Mismi is a mountain peak of volcanic origin located in the Andes mountain range of Peru. A glacial stream on the Mismi was firmly identified as the most distant source of the Amazon River in 1996; this finding was confirmed in 2001 and again in 2007....

 south of Cuzco

Cusco

Cusco , often spelled Cuzco , is a city in southeastern Peru, near the Urubamba Valley of the Andes mountain range. It is the capital of the Cusco Region as well as the Cuzco Province. In 2007, the city had a population of 358,935 which was triple the figure of 20 years ago...

 where it first becomes Apurímac River

Apurímac River

The Apurímac River rises from glacial meltwater of the ridge of Nevado Mismi, a mountain in the Arequipa Province in southern Peru.The Apurímac is the source of the world's largest river system, the Amazon River...

, then the Ene River and Tambo River before its waters meet the Ucayali River which later forms the Amazon.

The Ene is formed at 12°15′45"S 73°58′30"W at the confluence of the Mantaro River

Mantaro River

The Mantaro River is a long river running through the central region of Peru. Its Quechua name means "great river".-Geography:The river has its source at Lake Junín at a height of 4.080 m and runs through Junín, Yauli, Jauja, Concepción and Huancayo provinces in Junín Region, then through...

 and the Apurímac River

Apurímac River

The Apurímac River rises from glacial meltwater of the ridge of Nevado Mismi, a mountain in the Arequipa Province in southern Peru.The Apurímac is the source of the world's largest river system, the Amazon River...

, circa 400 m above sea level, where the three Peruvian Regions Junín

Junín Region

Junín is a region in the central highlands and westernmost Amazonia of Peru. Its capital is Huancayo.-Geography:The region has a very heterogeneous topography. The western cordillera located near the border with the Lima Region, has snowy and ice covered peaks. On the east, there are high glacier...

, Cusco

Cusco Region

Cusco is a region in Peru. It is bordered by the Ucayali Region on the north; the Madre de Dios and Puno regions on the east; the Arequipa Region on the south; and the Apurímac, Ayacucho and Junín regions on the west...

, and Ayacucho

Ayacucho Region

Ayacucho is a region of Peru, located in the south-central Andes of the country. Its capital is the city of Ayacucho. The region was one of the hardest hit by terrorism during the 1980s during the guerrilla war waged by Shining Path known as the internal conflict in Peru.A referendum was held on...

 meet.

The river flows in a northwesterly direction at a total length of 180.6 km.

At 11°09′39"S 74°14′48"W Río Ene joins Perené River

Perené River

The Perené River is a Peruvian river on the eastern slopes of the South American Andes.It is formed at at the confluence of the Chanchamayo River and the Paucartambo rivers, 15 km above the community of Perené, at 650 m above sea level....

, at the town of Puerto Prado, 295 m above sea level, and is called the Tambo from then on.