Ucayali

Amazon River's main headwater is the Ucayali River. It rises around 110 kilometers north of Lake Titicaca in Peru's Arequipa area and merges into the Amazon near Nauta city at the confluence with the Maraón. The city of Pucallpa is situated on the Ucayali River's banks.

The Ucayali River, along with the Apurmac, Ene, and Tambo Rivers, is now considered the main headwater of the Amazon River, stretching 2,669.9 kilometers from the Apurmac's source at Nevado Mismi to the junction of the Ucayali and Maraón Rivers.

San Miguel was the first name given to the Ucayali, which was followed by Ucayali, Ucayare, Poro, Apu-Poro, Cocama, and Rio de Cuzco. Peru has organized a number of expensive and well-run tours to explore the country. One of them (1867) claimed to have come within 380 kilometers of Lima, and the little steamboat "Napo" sailed 124 kilometers beyond the Pachitea River's confluence with the Amazon and as far as the Tambo River, 1,240 kilometers from the Ucayali's confluence with the Amazon. The "Napo" then made it 56 kilometers upstream from the Tambo River's confluence to a position 320 kilometers north of Cuzco.

Total Length: 994 miles (wholly within Peru)