The octopus stone, ''Taiko-ishi'' 蛸石 (also called "Drum Rock") is a large stone at

Osaka Castle is a Japanese castle in Chūō-ku, Osaka, Japan. The castle is one of Japan's most famous landmarks and it played a major role in the unification of Japan during the sixteenth century of the Azuchi-Momoyama period. Layout The main tower ...

in Japan. The stone is near Sakura Gate. It is one of the largest of several

megalith A megalith is a large stone that has been used to construct a prehistoric structure or monument, either alone or together with other stones. There are over 35,000 in Europe alone, located widely from Sweden to the Mediterranean sea. The ...

s at the castle (by face area), at 5.5×11.7 meters and over . Its name is derived from the octopus shape visible on its lower left corner.

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* * * Stones Osaka Castle {{Japan-geo-stub