As stated, part of my goal was to better represent Japan, and in my opinion, much of what makes given setting and culture to most resemble Japan requires an island nation vs. a land-locked one. Because Japan was an island, being so provided a buffer to help isolate Japan from the rest of Asia and to develop its own unique qualities. Only large scale invasions by sea provide an adequete enough threat due to its isolation. Land-locked nations on the other hand are subject to every skirmishing raid that crosses its borders, and mitigates any opportunity to the empire's unique development.
Being on an island means, one's everyday experience and interaction with all things natural are generally limited to a small region. So concepts outside the normal become much more significant. The Japanese view on the supernatural, in general, is that of horror rather than wonder. The dreadful concept of the 'other' is greater to peoples isolated on an island vs. a land locked nation. For this reason, Rokugan, IMO, is not ideal to create a believable Japan analog.
With this in mind, here is a map of the empire and archipelago of Kaidan:
Here's an older map of the island of Yonshu (east central main island on the previous map), one of the 3 great isles of Kaidan, and the location for our introductory trilogy of modules set in Kaidan, The Curse of the Golden Spear. Note the use of ukiyo-e Japanese print art for the objects in this map - mountains, shrines, structures.
