The Sahara Desert

The height of action in this book takes place on the north rim of the Sahara Desert in the Tibesti Mountain
range.  Here is an image that might look like where Dr. Edwards and his team land to perform their initial investigation.  There have been many cave paintings and other archaeologically significant findings in these mountains.  Some of the papers on the historical implications of these discoveries are posted on the 'links' page. The unstable political climate of the countries surrounding these mountains makes for a lot of mystery and therefore provide a great place to house a fictional adventure. 

Whose to say that there isn't an ancient city buried in them thar hills?