Komoro Castle, Japanese castle in Komoro, Japan
Komoro Castle is a ruined castle in Komoro, Nagano Prefecture, built from 1487 and reshaped with stone walls by Sengoku Hidehisa around 1590. Its grounds sit lower than the surrounding town, in the deep Tagiri valley of Mount Asama, which served as a dry moat. The Honmaru, Ninomaru, Kita-no-maru, Minami-no-maru and Sanno-maru enclosures remain as stone walls and the keep platform; the Otemon gate of 1612 and the Sannomon gate, rebuilt in 1766, still stand.
The fortress was founded in 1487 by Ōi Mitsutada and underwent several renovations during the Azuchi-Momoyama period while serving as a strategic stronghold for successive rulers. The structure was expanded and modified over the centuries to meet changing military needs.
The castle grounds now function as a public park where visitors can explore museums and traditional structures that reflect how the site was once organized. In spring, cherry blossoms draw people who stroll through the grounds and gather in small groups beneath the trees.
The fortress sits just three minutes on foot from Komoro Station, making it easily accessible by train. Visitors should note that certain areas may close seasonally and weather can affect conditions on the grounds.
The castle sits lower than its surrounding town, so residents look down onto the grounds; this gave it the names Hole Castle and Pot Lid Castle. The deep valley of Mount Asama's Tagiri terrain served as a dry moat, and the Chikuma River cliff on the west side acted as a natural defence.
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