世界上最長的河流是尼羅河，流經(jīng)非洲東北部，總長度約為6650公里。尼羅河源于布隆迪高原，經(jīng)過坦桑尼亞、盧旺達、布隆迪、剛果民主共和國、南蘇丹、蘇丹和埃及七個國家，最終注入地中海。

尼羅河是非洲最重要的河流之一，對周邊國家的經(jīng)濟和農(nóng)業(yè)發(fā)展都有著重要的影響。它為周邊地區(qū)提供了充足的水源，支持了大量的灌溉農(nóng)業(yè)和養(yǎng)殖業(yè)。此外，河流還是很多城市和村莊的主要水源。

在尼羅河上還有許多著名的景點和歷史遺跡，如埃及的金字塔和盧克索神廟等。這些景點吸引了眾多游客前來參觀游覽。

總之，尼羅河是非常重要和有價值的自然資源，它的存在對世界有著重要的意義。

The world's longest river is the Nile River, which flows through northeastern Africa and has a total length of about 6,650 kilometers. The Nile River originates from the Burundi plateau, passes through Tanzania, Rwanda, Burundi, the Democratic Republic of Congo, South Sudan, Sudan, and Egypt, and ultimately flows into the Mediterranean Sea.

The Nile River is one of the most important rivers in Africa, and it has a significant impact on the economies and agricultural development of surrounding countries. It provides abundant water resources for irrigation agriculture and animal husbandry. In addition, the river is also the main source of water for many cities and villages.

There are many famous tourist attractions and historical sites on the Nile River, such as the pyramids and Luxor Temple in Egypt. These attractions attract many tourists to visit.

In summary, the Nile River is a very important and valuable natural resource, and its existence has important significance for the world.