South-to-North Water Transfer Project, China
The North of China is home to almost 50 percent of China’s population but has only about 20 percent of the country’s water resources. To remedy this imbalance, China has funded construction of three huge canals, each more than 600 miles long and carrying water to the North from China’s three largest rivers. The project has a 48-year construction schedule. After completion of this project it will supply 44 billion cubic meters of water each year.