三納谷城には 高見山城の異称があります。三納谷大師839番地の東南東の山 北緯34度52分54秒・東経133度46分51秒付近が「三納谷城跡」（標高約３５０高さ約１３０m 広さ・東西約８０m×南北約１２０m）です。火雷神社Ho-no-Ikaduti-jinjya/Karai-jinjyaから 尾根伝いに４５０m 程 南下した処で 三納谷の平野や 宇甘川沿いの南方が見張らせます。城域は 東西 凡そ 80 ｍ×南北 120 ｍの歪んだ繭型で 北北西に傾居ます。山頂部の曲輪が主郭でしょう。

主郭の曲輪は 東西 12 ｍ×南北 57 ｍ の規模で、南西の端部分は２段に 緩やかに傾斜し下ります。 曲輪の南端に帯曲輪があり、低い土塁らしき構造の南に 堀切が ２条あります。主郭の曲輪の北側は 斜面部になっており ３面の腰曲輪 があります。北西尾根の傾斜が穏やかになる所に 堀切１条が掘られています。三納谷城の城主は 松田氏の家臣 高見小四郎だったと言う説もありますが、高見小四郎の親族の高見源右衛門は 福山城にいた事がある上、周囲の城は 全て虎倉方です。虎倉方領内に 飛び地のように 松田領が有るとするのは 説得性を欠くので、高見小四郎は 虎倉方の将であると判断します。「加茂川町の山城」　この頃の虎倉城は 松田氏の金川城の支城でしたので、高見小四郎は 松田氏の家臣でもあります。三納谷良心販売所から 三納谷城跡を 臨んでいます。なだらかな山の下に 並行するような形状の やや色が濃く写っている山、竹藪の向こうの山が 高見山です。

火雷神社Ho-no-ikaduti-jinjya/Karai-jinjyaの拝殿から 鳥居に向かうと 左手に駐車場に向かう道があるので、駐車場の左奥から 山道に進みます。山道を 尾根沿い にどんどん進むと、頂上をやや下り 左手の 休耕地と思われる平坦地が 途絶える先の右手に 数段の平坦地があります。更に 少し進むと 頂上に出ます。頂上には 数段の平坦地があり、空堀らしい跡が 堆積物で 埋められています。三納谷城には 数個の石垣と空堀が１本あると言うのですが、空堀は 北端、南端に３～４本あり  石垣は見つかりませんでした。小判や 瓦が 発掘されたと言う人もいました。更に下ると 鉱山跡と思われる穴が 埋められた所に着きます。東側の一個の坑洞の前には 掘り出された石が 積まれています。幾つもの平坦地が 重なります。 The ruins of Minoutani-jyou/castle are located on  the mountain at the east-southeast of 839  Minoutani-Daisi     It is said that the lord of the castle was Kosirou Takami who was a vassal of Matuda　clan   　 Because Gen-uemon Takami who was a relative of Kosirou, lived in Hukuyama-jyou and the all neighboring castles were belonged to Kokura-jyou side, and it is lack convincing that Matuda’s territory was in the Kokura side’s territory as a outland, Koshiro Takami is judged to be a general of Kokura’s side ”side of Hisataka Iga”    Because in that time Kokura-jyou which Hisataka Iga lived in, was a branch castle of Kanagawa-jyou which Mototeru Matuda lived in , It is not a mistake necessarily that Kosirou Takami regard as a vassal of Matuda clan

If you go from the Ho-no-Ikaduti-jinjya/shrine toward the shrine gate, there is a parking are on left side, proceed the mountain path from the parking area   If you go along the mountain path on the ridge steadily, you will reach the first top of the mountain    If you go down a little from the peak toward the end of left side-flat lands which seem the abandoned farmlands,  you will reach few steps of flat lands on right side    If you go a little further, you will reach to the second peak   There are several flat lands on the peak, the trace which seems to be an dry moat was buried with the deposits    It is said that there are several stone walls and one dry moat in Minoutani-jyou/castle, but the stone wall was not found    Some people said that Kobans "a former Japanese oval gold coin" and tiles were excavated   If you go down further,  you will reach the place where the hole which seems to be the mine site, was buried with sediments and stones    A tunnel on the east side is loaded with excavated stones, and several flat lands overlap

Shows you the another route how to go there   If you go about 120m along the mountain path from the Ho-no-Ikaduti-jinjy “karai-jinjy” toward the north, there is a branch which runs to the northwest  at 34 degrees 53 minutes 5 seconds north latitude and 133 degrees 46 minutes58 seconds east longitude where is the corner of abandoned arable land   If you do not choose the branch to the northwest, and go the path about 45m to the south-southwest, there is a pedestal arranged with stones which the Marisi-ten ”goddess of war” was enshrined at 34 degrees 53 minutes 3 second north latitude and 133 degrees 46 minutes 57 seconds east longitude    If you go down about 180m to the south along the ridge, the your path joined the mountain way which diverges to the northwest a little while ago, you will reach five forks path where a Rin-tou “a memorial tower stacked vertically with stones containing round stones” is enshrined   If you procced the path to the southwest along the west side of the top,  you will reach to the flat lands where the abandoned copper mines are located    If you climb about 30m to the south from the five forks path, proceed about 60m west along the contour line and go about 60m to the southwest along the ridge which climb toward the top, you will reach the narrow flat lands from north to south on the top

三納谷東公民館は 三納谷妙見735番地の東北　北緯34度53分7秒・東経133度46分38秒に建ちます。吉備中央町のお城一覧「城郭放浪記」では 三納谷城の本丸（主郭）とします。しかし樹木に覆われ神社様の公民館がありますが、削平されているだけの地で 防備の施設はなく 山城の遺構とは思えません。しかし３人の村人は「ここは三納谷城の出城です」と 口を揃えて言います。三納谷城の主郭とするには 無防備過ぎる構造ですので 一時的な兵の集結地だったのでしょう。「岡山県加賀郡吉備中央町のお城一覧(城郭放浪記) www.hb.pei.jp/shiro/okayama/?c=kibichuo」     Minoutani- Higashi -Kouminkan “Public hall“ is located at 34 degrees 53 minutes 7 seconds north latitude and 133 degrees 46 minutes 38 seconds east longitude where is the northeast side of 73 Minoutani-Myouken    It is written in 「List of castles in Kibityuuou-tyou "Castle Wandering Record"」 that Minoutani- Higashi-Kouminkan is ruins of the main closure of Minoutani-jyou/castle    However, there is a public hall which seem a shrine surrounded by trees in this place, but because this place is just shaved and flattened and there are no facilities for defense against enemy, I think it is not the ruins of the mountain castle    However, the three villagers told me that, this place is the ruins of branch castle of Minoutani-jyou　Because the structure is too defenseless as the main residence of Minoutani-jyou, It must have been a temporary gathering of troops   火雷神社：上田西１５８番地 北緯３４度５３分０９秒・東経１３３度４７分１０秒    城山：上田西２・２２番地等　城山：三納谷６１・８７番地等　城山：三納谷１１６７・１１７３番地等　金山：三納谷８４・１６４番地等　高見：三納谷１３０・１９３番地等　大師：三納谷７９２・８４２番地等      平成２３年（２０１１年）１０月７日