From the introduction:
Welcome to The Western Alliance, the fifth entry in the popular fan-made line of gazetteers describing the world of Mystara – the only game world designed for the classic box-set series of Dungeons & Dragons by TSR/Wizards of the Coast.
The Western Alliance has a two-fold purpose. The first is to serve as an appendix to the Idris-cycle of gazetteers (GAZ F1-F4) that covered Wendar, Denagoth, the Northern Wildlands, and Ghyr. The people and history of the Alliance are inextricably tied to those lands. The “Idrisian Grimoire” at the end of the gazetteer addresses a few questions about the previous products.
More importantly, the Alliance is a wonderful, unique land characterized by the feel of tall tales, impish gnomes and brooding giants cast against the backdrop of kingdoms coming into their own. It is the final redoubt of Known World Culture, and the nations face their own perils.
It was an exceptional labor of love, and I hope you enjoy reading The Western Alliance and using it in your own campaigns.