At high tide, the ocean currents from the Bungo-suido Channel and the Kii-suido Channel flow into the Seto Inland Sea, where they collide off the coast of Tomonoura (located roughly in the center of the Seto Inland Sea); at low tide, however, they flow away from each other, with the current from the Kii-suido Channel flowing to the east and that from the Bungo-suido Channel flowing to the west and the coast of Tomonoura serving as a kind of central border.
瀬戸内海の海流は満潮時に豊後水道や紀伊水道から瀬戸内海に流れ込み瀬戸内海のほぼ中央に位置する鞆の浦沖でぶつかり、逆に干潮時には鞆の浦沖を境にして東西に分かれて流れ出してゆく。