From the back cover:
The world is at your fingertips.
The entire planet of Abeir-Toril has been laid out before you with this completely interactive atlas.
Explore never-before-seen realms, sprawling cities, treacherous overland routes, perilous dungeons--or more than 500 maps from FORGOTTEN REALMS adventures.
Examine the maps of entire continents, or zoom in for local details. Players and DMs alike can print out every square foot, mile, and quadrant to accentuate their roleplaying adventures.
Everything is customizable. DMs can modify existing maps and add new levels of detail using the AD&D(R) Core Rules Version 2.0 CD-ROM or ProFantasy's Campaign Cartographer 2(TM). The more than 500 new map symbols are available to use in your own maps as well.
Put the power of the FORGOTTEN REALMS Interactive Atlas at your disposal and see a new level of detail in your adventures.