The oldest and most complex civilization in world is the Harappa Civilization. The civilization date backs to 2500BCE. This civilization consist many well developed and flourished cities. This civilization is supposed to be the oldest because it used both stone and copper. The main feature of this is it had well organized urban set up and a strong economy. The Indus River is used for navigation, irrigation, trade. The mature phase of the civilization is called as the Harappan Civilization. Mohenjo and Harappa was considered as well planned cities. In these cities the trade flourished and had good revenue for the civilization. The city had good sewage system and the people there lived in stone houses. Like Egyptians people in Harappa used early form of writing. Thus this civilization dated the very old one and complex one.
