The Amazon (1)________in a stream near the top of a mountain which (2)_____ Cerro Huagra. The stream is called the Huarco. (3)______the Huarco becomes a river which is known (4)_____ the Ucayali. The Ucayali then becomes the Amazon. The (5)______of the Amazon from the beginning of the Huarco to the Atlantic Ocean is 6,448 kilometers.