* Image is for illustrative purposes only.Takashima Castle (Floating Castle of Suwa)
高島城（諏訪の浮城）
Takashima Castle (Floating Castle of Suwa) is a historic castle in Chūbu dating from the Built in 1593 (Bunroku 2), whose lord was Hine Takayoshi / Suwa Yorimizu / Suwa clan.
Overview
About the Castle
Takashima Castle was a water castle built in Bunroku 1 (1592) by Hineno Takayoshi, a retainer of Toyotomi Hideyoshi, on the shores of Lake Suwa. Named the "Floating Castle of Suwa" for its appearance as if floating upon the lake's surface, this elegant epithet became cherished throughout history. The layout of Takashima Castle, which ingeniously exploited Lake Suwa's vast expanse as a natural moat to maximum effect, exemplifies the masterwork of water-castle architecture. In antiquity, water channels were drawn from the lake into the castle, and the Honmaru, Ninomaru, and Sannomaru are believed to have formed island-like structures surrounded by water. This sight, complemented by the sublime vista of the Northern Alps' lingering snow reflected in Lake Suwa as seen from Azumino, created one of the most poetically rich landscapes in Japanese castle architecture. Hineno Takayoshi, who directed the castle's design, was a figure deeply involved in numerous castle construction projects under Hideyoshi, and his fortification plan—which read Lake Suwa's topography and exploited it with exceptional skill—demonstrated his mastery. Due to land reclamation projects in the Meiji era that caused Lake Suwa's shoreline to recede, present-day Takashima Castle now stands at a distance from the lakeshore, yet in its heyday it stood as a magnificent structure literally floating upon the lake.
Suwa Taisha and Faith
The land of Suwa is a sacred place that houses Suwa Taisha, one of Japan's oldest shrines. Suwa Taisha is the head shrine of over 25,000 Suwa shrines throughout the nation, with a history said to trace back to the Jomon period. The Suwa deity, Takeminakata-no-kami, was deeply venerated by samurai as a god of war and hunting, and prior to battle, warlords of the Sengoku period prayed for victory at Suwa Taisha. Takeda Shingen deeply revered Suwa Taisha, and it is said that the source of Shingen's military strategy—feared as the "Tiger of Kai"—lay in his faith in the Suwa deity. Suwa Taisha comprises four shrines: the Upper Shrine (Hongu and Maegū) and the Lower Shrine (Akimiya and Harumiya), positioned across Lake Suwa to form a unified sacred realm. This unique configuration of four shrines has no parallel anywhere in Japan and represents a precious testament to Japan's religious history, transmitting the memory of the Jomon period to the present day. Samurai revered the Suwa deity as a "god of war" and unfailingly visited Suwa Taisha before setting out to battle, praying for its divine protection.
History of the Takeda and Suwa Clans
The Suwa clan flourished from the Kamakura period onward as a prominent family of Shinano Province, holding dual authority—both spiritual and martial—as the Great Priest (Ōhōri) of Suwa Taisha. In Tenbun 11 (1542), Takeda Shingen attacked and destroyed Suwa Yorishige, bringing Suwa under Takeda control. This incident marked an important chapter in the Takeda clan's invasion of Shinano, laying the foundation for later campaigns such as the Battle of Nagashino and the battles at Kawanakajima. Suwa Yorishige's daughter, Suwa Goryonin (later also called Kōiehime, mother of Takeda Katsuyori), became a concubine of Takeda Shingen, and their son Takeda Katsuyori became the heir to the Takeda clan. This blood relationship left a complex historical legacy in Suwa even after the Takeda clan's fall. The strategic vision of Takeda Shingen, symbolized by his battle standard "Furinkazan" (Wind, Forest, Fire, Mountain), was intertwined with his faith in the Suwa deity, and Suwa's warrior culture shone brightly under the patronage of the powerful Takeda clan. Even after the Takeda clan's destruction, the Suwa warrior family survived and achieved restoration as lords of Suwa Domain in the Edo period.
The Edo Period and Suwa Domain
Following the Battle of Sekigahara, the Suwa clan recovered their former domain and became lords of Suwa Domain (30,000 koku), governing the land until the late Edo period. Takashima Castle served as the political and cultural center of Suwa Domain, and the castle town developed industries in crafts and commerce. The buildings were demolished following the Meiji abolition of feudal domains, but in 1970 (Shōwa 45), the keep was restored through the efforts of the townspeople. Though constructed of reinforced concrete, the current keep faithfully reproduces the elegant three-story tower of former times, standing on the shore of Lake Suwa. Throughout the Edo period, Suwa Domain fostered industries such as silk production, raw silk, and lacquerware, establishing the economic foundations of the castle town. The castle town of Takashima developed as a center of commerce and crafts, with the castle town and the gate town before Suwa Taisha existing in unity, forming a distinctive urban structure. This townscape of Suwa, where warrior culture, the shrine, and commerce coexisted, presents a fascinating case study of the diversity of local cities during the Edo period.
Suwa's Nature and Swords
Suwa is also a region of iron production, and Suwa's faith in the Shinto deity has been deeply intertwined with the culture of iron and swords since ancient times, including reverence for the Oniwatari—the phenomenon of Lake Suwa's ice cracking and rising up—as a manifestation of divine presence. The sword smiths of Suwa, using Shinano's iron sand and clear water, continuously forged practical blades suited to the needs of mountain warriors. A visit to Takashima Castle is a journey to experience the profound warrior culture of Shinano, spanning from the age of Takeda Shingen through the Edo period. Some of the swords treasured by Suwa Domain samurai are displayed in the keep's exhibition hall, welcoming visitors as exhibits embodying the spiritual bond between Suwa Taisha and the warrior spirit. The sword culture of Suwa, nurtured by Shinano's crystalline air and water, forms a unique realm where utility and beauty exist in perfect equilibrium—a pure manifestation of mountain warrior spirituality. Takashima Castle stands as a place where the profound reverence for nature cultivated by Suwa's people through their annual witnessing of the Oniwatari at Suwa Taisha intersects with the warrior spirit kindled in the flames of sword-forging, quietly posing fundamental questions of Japanese culture to those who visit. Gazing upon the three-story keep standing on the lakeshore while observing the silhouettes of mountains reflected in Lake Suwa, one may discern the shadow of the warrior soul.
Connection to Swords
Takashima Castle's sword culture is inseparable from the Suwa Taisha shrine, one of Japan's oldest and most revered military shrines. Warriors from across Japan offered swords before battle and after victory, making Suwa Taisha one of the greatest repositories of historical blade offerings. Takeda Shingen, who conquered the Suwa domain in 1542, was an avid sword collector whose patronage supported Shinano Province's swordsmithing tradition. Practical, battle-hardened blades were the hallmark of Shinano swordsmiths serving the mountainous region's warriors. After Sekigahara, the Suwa clan's official swordsmiths continued the tradition with aesthetically refined pieces suited to the peaceful Edo period. The castle tower museum and Suwa Taisha Treasure Hall preserve domain swords and historic blade offerings.
Highlights
- Takashima Castle tower (1970 reconstruction, Suwa domain history museum)
- Suwa Taisha (four shrine precincts — one of Japan's oldest shrines, military god)
- Suwa Taisha Treasure Hall (swords and arms offered by warriors)
- Lake Suwa 'Omiwatari' (ice ridges on the frozen lake surface, a millennium-old sacred phenomenon)
- Katakura-kan bathhouse (Important Cultural Property, Roman-style communal bath from 1928)
- Lake Suwa fireworks festival
* Opening hours and admission fees are subject to change. Please check the official website before visiting.