From the publisher's blurb:
Although the City of Busiris itself is a fascinating place to explore and adventure in, it is just a gateway to an entire world. Beyond its ancient cyclopean walls lie towns and lush farmland, soaring mountains, the immense expanse of the Great Salt Desert, and beyond this the dangers and fabulous wealth of the jungle interior.
Each of these locations has a history, and part to play in modern Busiris. Underlying all of them, however, are the ruins and terrible secrets of the Ancient Ones.