湄公河干流全长4908千米,是亚洲最重要的跨国水系,世界第九长河流,亚洲第七长河流;主源为扎曲,发源于中国青海省玉树藏族自治州杂多县。流经中国云南省、老挝、缅甸、泰国、柬埔寨和越南,于越南胡志明市以南省份流入南海。亚马孙河流经秘鲁、厄瓜多尔、哥伦比亚、委内瑞拉、圭亚那、苏里南、玻利维亚和巴西等国,最终在巴西流入大西洋。乌拉尔河是亚欧两洲界河。源于俄罗斯境内的乌拉尔山脉南部山地。上源沿南乌拉尔山脉东麓南流,沿途经马格尼托哥尔斯克等重工业城市,至奥尔斯克折向西流。在奥伦堡以下,纳最大支流萨克马拉河后,继续西流入哈萨克斯坦境内。于乌拉尔斯克再次转向南流,于河口大港古里耶夫注入里海。多瑙河在欧洲仅次于伏尔加河,是欧洲第二长河。它发源于德国南部,自西向东流,流经奥地利、斯洛伐克、匈牙利、克罗地亚、塞尔维亚、保加利亚、罗马尼亚、摩尔多瓦,乌克兰,最后注入黑海。
The main stream of the Mekong River is 4,908 kilometers long and is the most important transnational river system in Asia. It is the ninth longest river in the world and the seventh longest river in Asia. The main source is Zaqu, which originates in Zaduo County, Yushu Tibetan Autonomous Prefecture, Qinghai Province, China. It flows through Yunnan Province, Laos, Myanmar, Thailand, Cambodia and Vietnam, and flows into the South China Sea in the province south of Ho Chi Minh City, Vietnam. The Amazon River flows through Peru, Ecuador, Colombia, Venezuela, Guyana, Suriname, Bolivia and Brazil, and finally flows into the Atlantic Ocean in Brazil. The Ural River is the boundary river between Asia and Europe. It originates from the southern mountains of the Ural Mountains in Russia. The upper source flows south along the eastern foot of the South Ural Mountains, passing through heavy industrial cities such as Magnitogorsk along the way, and turns west to Orsk. Below Orenburg, after the largest tributary of Na, the Sakmara River, it continues to flow west into Kazakhstan. It turns south again at Uralsk and flows into the Caspian Sea at the river mouth of Guryev. The Danube is the second longest river in Europe after the Volga River. It originates in southern Germany and flows from west to east, passing through Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, Moldova, Ukraine, and finally flows into the Black Sea.