They say 12,500 years ago the Sahara once had rivers everywhere and it was green and verdant. That there once was a massive river flowing along the Atlas mounta

They say 12,500 years ago the Sahara once had rivers everywhere and it was green and verdant. That there once was a massive river flowing along the Atlas mountains on the southern side to what we know as Mauretania. Was that where Atlantis located? Because with that massive river on the southern side of the mountains and the Atlantic and Mediterranean on the northern side it would have been a big fucking island.