Here's why:
* Low elevation: The Salton Sea is situated in a depression, with an average elevation of -227 feet (or -69 meters) below sea level.
* Minimal elevation change: The entire basin surrounding the Salton Sea is relatively flat, with minimal elevation changes.
* Large surface area: The Salton Sea covers a significant area, adding to its overall flatness.
While there are other flat places on Earth like the Black Rock Desert in Nevada or the Uyuni Salt Flats in Bolivia, the Salton Sea holds the record for the lowest elevation in North America, making it one of the flattest.
