The next maps shows the world's most populated areas depend on irrigation for agriculture.
VIDEO - Irrigation for agriculture
Agriculture and irrigation have affected the rise and fall of many great civilizations. Without agriculture, our way of living would cease to exist as it does today. Without irrigation, we would not have agriculture.
Agriculture is the farming of crops. It provides most of the world's food supply and helps support the economy.
Irrigation is the act of moving water from one place to another and is used in farming to water crops.