A Google Maps view of the Hiroshima and Itsukushima area. Sai lives on Itsukushima Island, where the marker is located.
A closeup of Itsukushima or Miyajima Island on Google Earth.
A further close up of part of Miyajima's coast. On the right, you see the populated tourist area. On the left, you see the deeper water and unpopulated area where Sai's cave is located.