As the name tells you, Kansai Hiroshima Area Pass covers Kansai area (Kyoto, Osaka, Nara, Kobe, Himeji, Wakayama), Hiroshima and many places between these, such as Okayama, Kurashiki. But the coverage is much bigger. This pass covers even Takamatsu in Shikoku, Kinosaki Onsen, Amanohashidate, Kii-Katsuura, Shingu.
I would like to share the information about Kansai Hiroshima Area Pass in this post.
I published several post about the limited express trains to Sanin area, such as Super Oki, Super Matsukaze, Super Inaba, Super Hakuto and Hamakaze. But there are some more trains from Osaka and Kyoto to Kinosaki-Onsen area. And there are several gateway stations. You might be confused.