The municipalities of Shimonoseki in Yamaguchi Prefecture and neighboring Kitakyushu are set to enact identical ordinances aimed at preserving the landscape of the Kammon Strait separating them.
Shimonoseki, located at the westernmost tip of Honshu, and Kitakyushu, on the northern coast of Kyushu, face each other across the strait.
The Kammon suspension bridge, completed in 1973, links the two cities. They are only about 650 meters from one another at the narrowest point of the strait.