On the Okayama side lie the Kasaoka Islands .
The group is situated between Okayama Prefecture and Kagawa Prefecture in the western Bisan Seto and consists of 28 islands of various sizes .
On the Okayama Prefecture side lie the Kasaoka Islands .
The group is situated between Okayama Prefecture and Kagawa Prefecture in the western Bisan Seto and consists of 28 islands of various sizes .