I've been reading the Atlantis: Geographica sourcebook for the Atlantis: The Second Age RPG,and am up through the Europa chapter, and wanted to say that I'm having a ball reading this book.
The material presented in the Atlantis: Geographica isn't really substantially different than the material provided in the old Morrigan rulebook in the massive Geography section there, though there are some nice changes/tweaks and slightly different emphasis on stuff to reflect the game's new sword & sorcery roots, though I have to admit that the removal of the Christian mythology and the faeries elements and its replacement by other world culture views has been refreshing (and some of the latter can still be found in the game, as the Jinn are the sort of faeries folk of the setting). The supplement is chock full of sidebars, many of which are observations about the main text materials from the viewpoint of Atlantean characters (notably our friends Donobey, Thalmia, and Caerwyn from the main rulebook), as well as sidebars that add interesting facts and notes about the main text subject matter, and these have made reading this book quite enjoyable. Each continent is accompanied by a section on Flora for that region, as well as a section of around 10+ locations of interest that provide some lovely fodder for adventure ideas and the like. Atlantis: Geographica doesn't come off like a dull geography text, which was one of my concerns about the book, and I am grateful for this. The fact that this book doesn't have any game mechanics and rules (other than in the material on the Flora of the various parts of the world) means that it is wonderfully suited to being used for any game system, although the mythology and the nature of the world would certainly have to be dealt with when using it as the basis for another game system.
So far, I have been enamoured of the Alba/Iber section and the changes made to the Sidhe, and quite enjoyed the material on Eria and some of the Ophidian elements of that part of the world (I am trying not to give too much away here!). I enjoyed the material on the Elysium Sea area as well, and the whole focus of that part of the world. While Europa was a bit... mundane... to me, it definitely has its moments, and there's some neat stuff in there, to be sure.
One of the things that I am hoping is that the Atlantis: Theragraphica (the beastie book) includes all of the beasties and the like mentioned in the various sections of the Geographica, 'cause if not, it'll be really annoying. And I also hope there's a bit more of a mundane bestiary covering some of the animals not found in the main rulebook.
Anyway, I just want to say that the writers of the book - Douglas Bramlett, Kieran Turley, and Jerry D. Grayson - have done a marvellous job on the Atlantis: Geographica (well, what I've read so far), though the editing could have been somewhat better. Lots of typos and, of course, I'm still confused on the proper spelling of certain parts of the world!
I'd be interested to hear what others have to say about the game, and I will add comments and thoughts on the rest of the book sections as I continue to read this wonderful supplement for the Atlantis: The Second Age RPG.