Composed of thousands of islands, it is not surprising that boats feature on some of the local manhole designs. This first one is from Hirado, the island in Nagasaki that was the center for trade with the Europeans especially the Dutch.
Kurahashi, a small island near Kure in Hiroshima, was where some of the early boats were built that transported diplomatic missions from the ancient court in Yamato to China and Korea.
Imari in Saga was where the local porcelain was exported, mostly to Europe.
Innoshima in the Inland Sea was a base for the pirates who controlled the shipping lanes and who eventually became part of the "navy" used by Hideyoshi in his failed invasion of Korea.
Etajima, the island in Hiroshima Bay that is home to the Japanese Naval Academy is reached via a short ferry ride from Hiroshima Port.