1.
Kisai Castle
- Condition: Reconstructed
- Castle Type: Flatland
- Prefecture: Saitama
- Historical Site: Local Historic Site
- Rating:
★
- Visited: Viewer Donated
2.
Oshi Castle
- Condition: Reconstructed
- Castle Type: Flatland
- Prefecture: Saitama
- Historical Site: Prefectural Historic Site
- Rating:
★
- Visited: 2001
3.
Sarushima Battery Island
- Condition: Ruins
- Castle Type: Flatland
- Prefecture: Kanagawa
- Rating:
★
- Visited: Viewer Donated
4.
Shinagawa Battery Islands
- Condition: Ruins
- Castle Type: Flatland
- Prefecture: Tokyo
- Historical Site: National Historic Site
- Rating:
★
- Visited: 2011
5.
Sugaya Yakata
- Condition: Ruins
- Castle Type: Flatland
- Prefecture: Saitama
- Historical Site: National Historic Site
- Rating:
★
- Visited: 2011
6.
Tatebayashi Castle
- Condition: Other Buildings
- Castle Type: Flatland
- Prefecture: Gunma
- Rating:
★
- Visited: 2007
7.
Tsuchiura Castle
- Condition: Other Buildings
- Castle Type: Flatland
- Prefecture: Ibaraki
- Historical Site: Prefectural Historic Site
- Rating:
★
- Visited: 2003
7 Castles