Construction of the first phase of the €200 billion ($265b), 500 MW solar thermal power project is planned to begin next year. The exact project location has yet to be determined, but is expected to be near Ouarzazate, south the Atlas Mountains. The project will take up 12 square kilometers (4.6 sq. miles) of desert.
Read more: The Guardian
As for the grand vision for Desertec, this map sketches it out: