Which Japanese peninsula includes the hot-spring resort city of Shimoda?

The Izu Peninsula includes Shimoda, a port and hot-spring resort city on Japan’s southeastern coast. The peninsula projects into the Pacific Ocean from Shizuoka Prefecture, southwest of Tokyo, and is one of Japan’s best-known onsen regions.

Shimoda sits near Izu’s southern tip and combines beaches, coastal scenery, seafood, and hot springs. It is also central to Japan’s modern diplomatic history: in 1854, Commodore Matthew Perry and his American fleet reached Shimoda after the Convention of Kanagawa, helping open Japan to Western trade and contact.

The other choices are separate Japanese peninsulas. The Kii Peninsula occupies much of southern Honshu, the Bōsō Peninsula is east of Tokyo in Chiba Prefecture, and the Noto Peninsula projects into the Sea of Japan. Shimoda’s combination of resort culture and international history makes Izu the canonical answer.