Gassantoda Castle (月山富田城, Gassantoda-jō) is a mountain castle, or yamashiro, located in Yasugi, Shimane Prefecture, Japan. Today, only its ruins still stand.
Gassantoda Castle is regarded as among Japan's Five Greatest Mountain Castles, along with Kasugayama Castle, Nanao Castle, Kannonji Castle and Odani Castle. Now it is one of Japan's nationally-designated historical ruins.
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