What is the longest river in the US – North America?
The longest river in North America formed in response to both Laurentide ice sheet glaciation and to glaciation of the Rocky Mountains.
北美洲最长的河流形成于劳伦斯冰盖冰川作用和落基山脉冰川作用。
1 . Where does the Missouri river flow through?
The Missouri is the longest river in the US – North America. The Missouri flows entirely though the United States, where it crosses seven states: Montana, North Dakota, South Dakota, Nebraska, Iowa, Kansas and Missouri.
The headwaters of the Missouri are located where the Jefferson, Madison and Gallatin rivers meet, in the Rocky Mountains, in Montana, 1,200 metres above sea level. It flows into the Mississippi river as its main tributary, 16 kilometres from the city of St. Louis.
1.密苏里河从哪里流过？
密苏里河是美国北美洲最长的河流。密苏里河完全流经美国，流经七个州：蒙大拿州、北达科他州、南达科他州，内布拉斯加州、爱荷华州、堪萨斯州和密苏里州。
密苏里河的源头位于海拔1200米的蒙大拿州落基山脉，杰斐逊河、麦迪逊河和加拉廷河交汇处。它作为主要支流流入密西西比河，距离圣路易斯市16公里。
2 . What is the Missouri river length and how big is it?
The Missouri is 3,943 kilometres long. If we consider the Mississippi-Missouri river system, the total length would increase to 7,725 kilometres, forming the world’s fourth longest river, after the Amazon, Nile and Yangtze rivers.
The drainage basin spans 1,371,100 square kilometres, making it the sixth largest one in the world, comprising 16,840 square kilometres in southern Canada.
2.密苏里河的长度是多少？它有多大？
密苏里河长3943公里。如果我们考虑密西西比-密苏里河水系，总长度将增加到7725公里，形成世界第四长的河流，仅次于亚马逊、尼罗河和长江。
该流域面积1371100平方公里，是世界第六大流域，包括加拿大南部的16840平方公里。
3 . History of the Missouri river
For thousands of years, the Missouri has been home to Native Americans. The first Europeans to discover the river were explorers Jacques Marquette and Louis Jolliet in 1673. After that, explorers Lewis and Clark (1804-1805) were the first to navigate from its headwaters to its mouth.
During the 19th century, steam boat traffic increased until 1858, when it started to decline. In 1944, the US Congress approved a programme for irrigation development, flood control, and hydropower generation.
3.密苏里河的历史
数千年来，密苏里州一直是美国原住民的家园。第一批发现这条河的欧洲人是1673年的探险家雅克·马奎特和路易斯·乔利特。在那之后，探险家刘易斯和克拉克（1804-1805）是第一个从源头航行到河口的人。
在19世纪，蒸汽船的交通量一直在增加，直到1858年才开始下降。1944年，美国国会批准了一项灌溉开发、防洪和水力发电计划。
