The Huallaga Valley is located in northern 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....

, south of Tarapoto

Tarapoto

Tarapoto, known as the "City of Palms", is a thriving commercial hub in northern Peru, an hour by plane from Lima, situated in the San Martín Province of the San Martín Region, located in the high jungle plateau to the east of what is known as the selva baja...

. It follows the Huallaga River

Huallaga River

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....

.

Coca

Since the 1980s, the primary coca

Coca

Coca, Erythroxylum coca, is a plant in the family Erythroxylaceae, native to western South America. The plant plays a significant role in many traditional Andean cultures...

 growing and drug trafficking activities in Peru have been in the Upper Huallaga Valley. http://www.druglibrary.org/schaffer/govpubs/peru1.htm

The coca is flown to Colombia

Colombia

Colombia, officially the Republic of Colombia , is a unitary constitutional republic comprising thirty-two departments. The country is located in northwestern South America, bordered to the east by Venezuela and Brazil; to the south by Ecuador and Peru; to the north by the Caribbean Sea; to the...

, where it is used to create cocaine

Cocaine

Cocaine is a crystalline tropane alkaloid that is obtained from the leaves of the coca plant. The name comes from "coca" in addition to the alkaloid suffix -ine, forming cocaine. It is a stimulant of the central nervous system, an appetite suppressant, and a topical anesthetic...

, which is subsequently shipped to the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

.

Vladimiro Montesinos

Vladimiro Montesinos

Vladimiro Ilyich Montesinos Torres was the long-standing head of Peru's intelligence service, Servicio de Inteligencia Nacional , under President Alberto Fujimori. In 2000, secret videos, which he had recorded, were televised that showed his bribing an elected congressman to leave the opposition...

, ex-head of Peru's intelligence service

National Intelligence Service (Peru)

The National Intelligence Service was an intelligence agency of the Government of Peru. The agency was disbanded by Alberto Fujimori after its de facto chief, Vladimiro Montesinos, was caught paying bribes to major political, military and media figures. Fujimori later pleaded guilty to charges...

, is reported to have received $50,000 for every plane

Fixed-wing aircraft

A fixed-wing aircraft is an aircraft capable of flight using wings that generate lift due to the vehicle's forward airspeed. Fixed-wing aircraft are distinct from rotary-wing aircraft in which wings rotate about a fixed mast and ornithopters in which lift is generated by flapping wings.A powered...

laden with drugs allowed to leave the Huallaga Valley. http://news.bbc.co.uk/1/hi/world/americas/1263469.stm