Share the Headline Story with your students. Point out that most river lengths cannot be given precisely. Students might compare the lengths of the rivers by subtracting, doubling, or thinking about half.
The Nile River in Africa is more than 4,100 miles long. The Amazon River in South America and the Yangtze River in Asia are both about 3,950 miles long. The Missouri River is the longest river in North America. It is about 2,550 miles long. The Rio Grande River is about 1,900 miles long.