I decided I wanted to do a new AD&D campaign, but wanted to do something different, so I decided on an Oriental Adventures campaign. But I couldn't decide what setting I wanted to use, because I have a lot of the D20/Legend of the Five Rings crossover books with the Rokugan campaign setting. I finally decided I wanted to use some of the Rokugan elements, but didn't want to deal with the map and a lot of the background. So I went looking at the old Kara-Tur setting, but I don't have a lot of that material. One of my ideas was to make up my own setting, but use a map of Japan as an inspiration. I finally decided to use the four nations of Kara-Tur superimposed onto a map of Japan.