Tsukui Castle
A mountain castle on the slopes above Lake Tsukui in Sagamihara, Kanagawa, built by the Miura clan and later used by the Hojo. Its commanding hilltop position overlooking the modern reservoir creates a dramatic scenic contrast between the ruined stone walls and tranquil water below.
| Japanese Name | 津久井城 |
|---|---|
| Prefecture | Kanagawa Prefecture (神奈川県) |
| Region | Kanto (関東) |
| Castle Type | Mountain Castle |
| Year Built | 1537 |
| Designation | 続100名城 |
| Coordinates | 35.5833, 139.15 |
Tsukui Castle rises dramatically from the slopes above Lake Tsukui in Sagamihara, Kanagawa Prefecture, representing a mountain fortress built in 1537 by the Miura clan during a period of intense regional competition. This strategic stronghold later fell under the control of the Hojo clan, one of the most powerful daimyo families in the Kanto region.
The castle was constructed to defend against rival clans and control the surrounding territory during Japan's tumultuous Sengoku period. Its elevated mountain position provided exceptional surveillance capabilities and made it exceptionally difficult to assault. When the Hojo clan consolidated power in the region, they maintained and reinforced the castle's defensive systems, ensuring it remained a crucial component of their territorial defense network.
The site's most striking characteristic is the dramatic contrast between its ruined stone walls and the tranquil waters of the modern Lake Tsukui below. The reservoir, created in the 20th century, has transformed the landscape surrounding the castle while simultaneously highlighting its stark stone foundations against the contemporary landscape. The weathered stone structures testify to medieval construction techniques and the castle's strategic importance to regional powers.
Climbing to the hilltop ruins offers visitors both historical insight and panoramic views across the modern Sagamihara region. The preserved stone walls remain largely intact despite centuries of exposure, providing tangible evidence of the craftsmanship and durability of medieval Japanese fortifications.
Tsukui Castle is recognized as one of Japan's second 100 castles as designated by the Japan Castle Foundation, a distinction that highlights its historical and architectural importance among the hundreds of castle sites across the country. As a mountain castle, its design reflects the defensive priorities and construction techniques of its era, with origins dating to 1537. Visitors traveling to Kanagawa Prefecture can explore the site alongside other regional historical attractions, and the location is well served by public transportation from major nearby cities.