What is the longest river in the world?

The Nile River in Africa is traditionally considered the longest river in the world, stretching approximately 6,650 kilometres (4,130 miles). It flows through eleven countries, including Egypt, Sudan, and Uganda, before emptying into the Mediterranean Sea. However, the Amazon River in South America has recently been argued to rival the Nile in length, depending on how measurements are taken. Regardless, the Nile has played a crucial role in the development of ancient Egyptian civilization and continues to be vital for agriculture and transportation in the region.