I really appreciated your Question, this is a breaf discription of Hiroshima.
Hiroshima was founded in 1589, on the coast of the Seto Inland Sea, and became a major urban centre during the Meiji period. The city is located on the broad, flat delta of the Ota River, which has 7 channel outlets dividing the city into six islands which project into Hiroshima Bay. The city is almost entirely flat and only slightly above sea level; to the northwest and northeast of the city, some hills rise to 700 feet. For more detailes visit this site