出羽三山(でわさんざん)の信仰は、房総半島に広く信仰されている。三山(さんざん)を参拝した記念に、参拝者の持ち帰った梵天(ぼんてん)(オフダ)を納めて上に塚を築いたものが供養塚(くようづか)で、その上に供養塔を建てた。指定の供養碑(くようひ)は、享和元年(1811)の銘があり、中央に智拳印を結ぶ金剛界の大日如来を陽刻し、中央に湯殿山、右に月山、左に羽黒山を陰刻してある。
参考：「改訂長柄町の文化財」（平成7年刊行）を見る
 
The belief of Dewa-sanzan (three mountains in Dewa which means Yamagata-ken and Akita-ken) was widespread in Bousou peninsula. Kuyou-zuka is a mound with Bonten ofuda (small wooden tablet) dedicated inside which a visitor brought back as a souvenir of visiting the three mountains. Kuyou-tou (tower) was built upon it. Kuyou-hi has an inscription of the Kyowa period 1 (1811) with Dainichi Nyorai of Kongou-kai in the symbolic gesture of the fingers in Chiken-in (knowledge-fist mudra) carved in relief in the center. In addition, each mountain of Dewa-sanzan is engraved. Yudono-san is in the center, Gassan to the right and Haguro-san to the left on it, relatively.
738 Tokumasu, Nagara-machi, Chousei-gun, Chiba-ken (Enkaku temple)