Shingu Castle (新宮城, Shingū-jō), also known by its alternative names Tankaku-jō (丹鶴城) and Okimi-jō (沖見城), carries a fascinating history. The name Tankaku-jō originates from an earlier residence of Princess Tankaku that once stood on the same hill. Okimi-jō, meaning “Ocean Viewing Castle,” reflects its strategic location overlooking the Kumano-nada Sea.

The castle stands on Tankakuyama Hill, near the mouth of the Kumano River — a site of great strategic importance for controlling both river and maritime routes.

Construction began in the early Edo period around 1601 under Asano Tadayoshi, and was later completed by the Mizuno clan, hereditary chief retainers (karō) of the Kishū Domain, who governed from the castle for generations.

Like many Japanese castles, Shingu Castle’s buildings were demolished in 1873 during the Meiji Restoration. Today, the site is known as the Shingu Castle Ruins, and the grounds have been transformed into Tankaku-jo Park, a serene public park offering scenic views and seasonal beauty.

Visitors can explore the well-preserved stone walls, showcasing distinct Japanese masonry styles such as kirikomi-hagi, and view the foundation of the main keep (tenshu-dai). The panoramic outlook over Shingu City, the Kumano River, and the Pacific Ocean is truly impressive. In spring, the site becomes a beloved cherry blossom viewing spot.

The ruins, along with the nearby Mizuno clan cemetery, have been officially designated as a National Historic Site of Japan and were included in the “Continued Top 100 Japanese Castles” list in 2017.

• From JR Shingu Station, the castle ruins are about a 10-minute walk to Tankaku-jo Park, which occupies the former castle site.

• The best time to visit is in late March to early April, when the cherry blossoms are in full bloom.

• In summer, the park offers clear views of the Kumano-nada Sea and surrounding landscapes.

• Bring comfortable shoes, as the park includes uphill paths.