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The Ucayali River ((スペイン語:Río Ucayali), ) arises about north of Lake Titicaca, in the Arequipa region of Peru. The Amazon River takes its name close to Nauta city (100 km upstream/south of Iquitos), at the confluence of the Marañón and Ucayali rivers. The Ucayali becomes a major tributary of the Amazon River. Navigation was blocked by lengthy sections of rapids. The city of Pucallpa is located on the banks of the Ucayali. The Ucayali, together with Apurímac River, Ene River, and Tambo River, is today considered the main headwater of the ''Amazon River'', totaling a length of from the source of the ''Apurímac'' at Nevado Mismi to the confluence of the Ucayali and Marañón Rivers: *Apurímac River (total length): *Ene River (total length): *Tambo River (total length): * Ucayali River (confluence with Tambo River to confluence with the Marañón): The Ucayali was first called ''San Miguel'', then ''Ucayali'', ''Ucayare'', ''Poro'', ''Apu-Poro'', ''Cocama'' and ''Rio de Cuzco''. Peru has fitted out many costly and ably-conducted expeditions to explore it. One of them (1867) claimed to have reached within of Lima, and the little steamer "Napo" forced its way up the violent currents for above the junction with the Pachitea River as far as the Tambo River, from the confluence of the Ucayali with the Amazon. The "Napo" then succeeded in ascending the Urubamba branch of the Ucayali above its union with the Tambo, to a point north of Cuzco. The remainder of the Urubamba, as shown by Bosquet in 1806 and Castelnau in 1846, is interrupted by cascades, reefs, and numberless other obstacles to navigation. Torres, who explored the Alto Ucayali for the Peruvian government, gives it a length of , counting from the mouth of the Pachitea to the junction of the Tambo and Urubamba. Its width varies from , due to the great number of islands. The current runs from , and a channel from wide can always be found with a minimum depth of . There are five bad passes, due to the accumulation of trees and rafts of timber. Sometimes enormous rocks have fallen from the mountains and spread over the river-bed, causing huge whirlpools. Ucayali is home to the Amazon River Dolphin, giant otter, and the Amazonian Manatee, which are abundant in Pacaya-Samiria National Reserve, close to Nauta. The southeastern border of the reserve is formed by the lower Ucayali River. The river gives its name to the Ucayali Region of Peru and Ucayali Province of the Loreto Region. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ucayali River」の詳細全文を読む スポンサード リンク
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