| Gassantoda Castle | |
|---|---|
月山富田城 | |
| Yasugi, Shimane Prefecture, Japan | |
 Former site of Gassantoda Castle | |
  Gassantoda Castle  Gassantoda Castle | |
| Coordinates | 35°21′49″N 133°10′58″E / 35.36361°N 133.18278°E |
| Type | Japanese castle |
| Site information | |
| Controlled by | Amago clan (1396–1566), Mōri clan (1566–1600), Horio clan (1600–1611) |
| Condition | Ruins |
| Site history | |
| Built | 1396 |
| Built by | Sasaki Yoshikiyo |
| Demolished | 1611 |
| Garrison information | |
| Past commanders | Amago Haruhisa, Amago Yoshihisa, Kuchiba Michiyoshi, Amano Takashige, Kikkawa Hiroie |
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Gassantoda Castle (月山富田城, Gassantoda-jō) was a Sengoku period yamajiro-style Japanese castle located in Izumo Province, in what is now part of the city of Yasugi, Shimane Prefecture in the San'in region of far western Japan. Its ruins have been protected by the central government as a National Historic Site since 1934.[1] Gassantoda Castle was built using the whole of Gassan's ridges and valleys, and is regarded as one of the five largest and most important medieval mountain castles along with Kasugayama Castle (Niigata), Nanao Castle (Ishikawa), Odani Castle and Kannonji Castle (Shiga).[citation needed]