Pakistan's principal natural resources are arable land and water. About 25% of Pakistan's total land area is under cultivation and is watered by one of the largest irrigation systems in the world. Pakistan irrigates three times more acres than Russia. Agriculture accounts for about 23% of GDP and employs about 44% of the labor force. Pakistan is one of the world's largest producers and suppliers of the following according to the 2005 Food and Agriculture Organization of The United Nations and FAOSTAT given here with ranking: