Odani Castle, Mountain castle in Nagahama, Japan
Odani Castle is a mountain fortress in Nagahama whose remains stretch more than 800 meters along a summit ridge. The outer defenses cover an area exceeding one square kilometer and include multiple defensive tiers.
Azai Sukemasa built this fortress in 1520 as a strategic stronghold for his family. The castle fell in 1573 after a three-month siege by Oda Nobunaga, marking the end of the Azai clan.
The castle holds recognition as one of Japan's Five Greatest Mountain Castles, alongside Kasugayama, Nanao, Kannonji, and Gassantoda fortifications.
Access requires a 45-minute walk from Kawake Station followed by an hour-long mountain hike. The path crosses steep terrain with narrow trails, so sturdy footwear and enough water are recommended.
The stone walls were built on terrain considered nearly unreachable at 495 meters elevation. Despite this extreme position, attackers managed to cut off the castle's water supply, leading to its surrender.
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