Wikipedia
Ōkunoshima
is a small island located in the Inland Sea of Japan in the city of Takehara, Hiroshima Prefecture. It is accessible by ferry from Tadanoumi and Ōmishima. There are campsites, walking trails and places of historical interest on the island. It is often called because of the numerous feral rabbits that roam the island; they are rather tame and will approach humans.
Ōkunoshima played a key role during World War II as a poison gas factory for much of the chemical warfare that was carried out in China.