Japan's narrowest peninsula stretches 50km west from Yawatahama into the Bungo Channel, measuring just 2–10km across. Route 197 — the Sadamisaki Melody Line — follows the south coast through citrus groves and fishing hamlets, with the Iyo Sea to the north and Bungo Channel to the south simultaneously visible at the thinnest section near Ikata. At the tip, Cape Sadamisaki Lighthouse marks the westernmost point of Shikoku. A ferry from Misaki to Saganoseki (Oita) makes this a natural gateway into Kyushu.
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