The Yangtze River is China's greatest river and a historic transport route. It is over 6,000 km (nearly 4000 miles) long, about the same as the Mississippi. Only the Amazon and Nile are longer. It is the world's fifth largest river by volume of water discharged, at over 30,000 cubic meters a second, roughly double the Mississippi or Mekong, three times the Saint Lawrence, four times the Danube or Columbia, and more than ten times little streams like the Rhine or Nile.