[FarCenter]

The Persian Gulf was freshwater lakes and rivers leading out through the Strait of Hormuz until about 12,500 years ago, when the rising sea level allowed saltwater intrusion into the central basin of the Persian Gulf. The western basin flooded about a 1000 years later.

Shoreline reconstructions for the Persian Gulf since the last glacial maximum

https://www.sciencedirect.com/science/article/abs/pii/0012821X96000696?via%3Dihub

[Rockingham]

Consider also the Burckle Crater, a prospective impact feature on the floor of the southern Indian Ocean thought to date to circa 3000–2800 BCE. That puts it within the ambit of the stories of Gilgamesh/Noah, and such an impact would have generated a massive tsunami and extended rains in the Persian Gulf and coastal Mesopotamia. Notably, there is a Mount Ararat in present day Iran.

Wikipedia - Burckle Crater

[PIF]

Too bad it is only an abstract of the 21 years old article.