From there, it tumbles through the chasms of the Black Canyon, joining the Colorado River, filling the giant Lake Powell reservoir, and, one day, flowing to Los Angeles. (scientificamerican.com)
Like the Romans or the Jews before, they wandered through the wilderness, eventually reaching a giant lake in the mountains where they built Tenochtitlan — the largest city in the world at the time, now called Mexico City. (scientificamerican.com)
The second team looked at DNA buried in the floor of the Black Sea, which was once a giant lake but became connected to the Mediterranean Sea roughly 9000 years ago, though the date is debated. (sciencemag.org)