Yashima: A Plateau of History and Culture

【Yashima】 (Takamatsu City, Kagawa Prefecture; Former Province: Sanuki)



Since the early modern period, Takamatsu City, which flourished as the capital of Sanuki Province (present-day Kagawa Prefecture), has been strategically located with Takamatsu Castle and its port situated in a gentle bay. Small islands dot the area in front of the bay, shielding it from waves and currents. The prominent terrain, particularly against the currents from the Kansai region, highlights why Takamatsu was considered an ideal location for a port and city. Among the peninsulas that protect Takamatsu, Yashima, adjacent to the city center and forming part of the bay, stands out.

Stretching approximately 5 kilometers from the base of the Aji Peninsula, Yashima is a landform that rose about 15 million years ago due to volcanic activity. The granite-based plateau reaches an elevation of 290 meters and is said to have been named for its resemblance to a house roof. In the relatively flat coastal areas of the Seto Inland Sea, its imposing presence jutting into the sea became a landmark for countless travelers and ships. In the 7th century, after the defeat at the Battle of Baekgang, the imperial court built Yashima Castle to prepare for invasions from Tang and Silla, marking its role as a strategic point in the Seto Inland Sea. Over time, it became a site of deep religious significance. Yashima Temple, located atop the mountain, symbolizes this history and traces its origins back to the Chinese monk Ganjin (688–763). During the Heian period, the temple complex was developed by Kobo Daishi Kukai (774–835), a native of Sanuki, and flourished as a Kannon pilgrimage site. Today, it remains part of the Shingon sect and serves as the 84th temple of the Shikoku Pilgrimage, attracting numerous visitors. The temple grounds also house a treasure hall, showcasing cultural artifacts, including the principal deity, a seated statue of the Thousand-Armed Kannon Bodhisattva. The second floor of the treasure hall features exhibits on the historic "Battle of Yashima," a significant event that etched Yashima's name into Japanese history.

The "Battle of Yashima," a famous scene from the Genpei War (1180–1185), occurred on February 19, 1185. After losing the capital and suffering defeat at Ichinotani, the Taira clan sought to regroup at Yashima. Skilled in naval warfare, the Taira used Yashima's plateau to shield their anchorage from waves. However, Minamoto no Yoshitsune (1159–1189) launched a surprise attack. Secretly crossing from Hyogo to Awa Province (present-day Tokushima Prefecture), Yoshitsune moved under the cover of night to the southern side of Yashima and struck the Taira from behind. Expecting a naval battle, the Taira were caught off guard by the land assault, abandoned their positions, and retreated to the sea. As the battle stalemated, a fan was raised on a pole aboard a Taira ship, and a court lady beckoned. Responding to this, Nasu no Yoichi, a samurai from Shimotsuke Province (present-day Tochigi Prefecture), prayed to Hachiman Daibosatsu and shot an arrow, hitting the fan with precision. This legendary feat was celebrated by both sides. Yashima, the site of this historic battle, preserves relics said to have been donated by Yoichi's descendants in the treasure hall of Yashima Temple. While the current landscape of Yashima and its surrounding seas differs significantly from the scenes described in war tales, the strategic necessity of the Taira's position to avoid eastern winds and attacks is evident.

Efforts to preserve and pass on this history and culture to future generations are becoming more active. At the center of these efforts is "Yashimaru" (Photos 1, 4–10). Officially named the "Yashima Summit Exchange Hub Facility," this site serves as a tourist information center for visitors and a community hub and art gallery for locals. Its unique architecture, resembling a roller coaster as it follows the undulating terrain, has drawn attention as a masterpiece of modern design. The glass-walled corridors offer panoramic views of the Seto Inland Sea, while the galleries and theaters feature exhibits on local artists, Yashima's natural beauty, and its historical allure. These displays are regularly updated to showcase Yashima's charm from new perspectives. Stepping outside, the roof made of locally sourced Aji stone reflects the soft hues of the setting sun, with the tranquil Seto Inland Sea stretching beyond. The scent of the sea breeze and the gentle sound of ship horns invite a deep, peaceful breath.

Recommended for solo travelers: ★★★ (While there are some visitors, the spacious area ensures a comfortable experience.)

Visit date: Weekday, 3rd week of January, around 5 PM

Access: About 20 minutes by car from Takamatsu Chuo IC (to Yashimaru).

Post by hanakin_kozakura | Oct 14, 2025