さあ、吸い込まれよう。異世界へのポータルめいた世界のダム穴（一部恐怖症注意） (4/4ページ)
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その他のダム穴
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via:Bell-Mouth Spillways: How Giant Holes in the Water are Possible・translated byいぶりがっこ / edited by parumo
動画の方はポルトガルのダム穴のドローン映像だ。
Covao do Conchos - Vista aerea (Probilder)
