Where was rainwater harvesting done first in the world?

Rainwater harvesting is believed to have first been practiced in ancient civilizations, particularly in the Middle East and parts of Asia. Archaeological evidence suggests that techniques for collecting and storing rainwater date back to around 4000-3000 BCE in regions like Mesopotamia, where early societies developed methods to capture and utilize rainfall for agriculture and domestic use. Other early examples include the systems used in ancient India and the Mediterranean.