Which Japanese peninsula is separated from Shikoku by the Kii Channel?

The Japanese peninsula separated from Shikoku by the Kii Channel is the Kii Peninsula.

The Kii Peninsula projects southward from Japan’s largest island, Honshu, and occupies much of Wakayama and Nara prefectures, along with parts of Mie and Osaka. Its Pacific-facing coastline is rugged, mountainous and heavily forested, while the Kii Channel forms the sea passage between its western side and Shikoku.

The region is closely associated with the Kumano religious landscape, including the pilgrimage routes known as the Kumano Kodo. Mount Koya, a major center of Japanese Shingon Buddhism, also lies in the peninsula’s mountainous interior. These cultural sites reflect the area’s long history as a destination for pilgrimage and retreat.

A common mix-up is with the Bōsō, Noto and Izu peninsulas, which are also on Honshu but lie in different parts of Japan. The Kii Peninsula should also not be confused with Kii Province, the historical administrative region that covered much of the same area.