Sadly, very little of it still reaches the sea anymore. From 20,000 up until 8000 years ago, the Persian Gulf, where the Tigris and Euphrates rivers drain into

Sadly, very little of it still reaches the sea anymore. From 20,000 up until 8000 years ago, the Persian Gulf, where the Tigris and Euphrates rivers drain into, was continuously filling in, and thousands of square miles where people lived were disappearing beneath the waves.