Asia
The coastal periphery was home to some of the world's earliest known civilizations, each of them developing around fertile river valleys. The civilizations in Mesopotamia, the Indus Valley and the Yellow River shared many similarities. These civilizations may well have exchanged technologies and ideas such as mathematics and the wheel. Other innovations, such as writing, seem to have been developed individually in each area. Cities, states and empires developed in these lowlands.
Cradle of civilization
A cradle of civilization is a location where civilization is understood to have emerged. Current thinking is that there was no single "cradle", but several civilizations that developed independently, with the Fertile Crescent (Mesopotamia and Ancient Egypt) understood to be the earliest. Other civilizations arose in Asia among cultures situated along large river valleys, such as the Indo-Gangetic Plain in Ancient India and the Yellow River in Ancient China. The extent to which there was significant influence between the early civilizations of the Near East and those of East Asia is disputed. Scholars accept that the civilizations of Mesoamerica, mainly in modern Mexico, and Norte Chico, in the north-central coastal region of Peru, emerged independently from those in Eurasia.