Kamijima is an archipelago of 25 islands (seven of which are inhabited) the
Seto Inland Sea in between
Shikoku and
Honshu, and is considered a subgroup of the
Geiyo Islands. The highest elevation is Mount Sekizen on Iwaki Island, with a height of 370 meters. The main islands are
Yugeshima, Sashima, Iwagishima, Akonejima, Tsunamijima, Ikinajima, Uoshima, Takaikamishima, Teshima, Enoshima, Hyakunoshima, Hyakkanjima (the northernmost tip of Ehime Prefecture)
Climate Kamijima has a
humid subtropical climate (Köppen
Cfa) characterized by warm summers and cool winters with light snowfall. The average annual temperature in Kamijima is 15.8 °C. The average annual rainfall is 1418 mm with September as the wettest month. The temperatures are highest on average in January, at around 27.2 °C, and lowest in January, at around 5.2 °C. ==Demographics==