Octopus stone

The octopus stone, Taiko-ishi 蛸石 (also called "Drum Rock") is a large stone at Osaka Castle in Japan. The stone is near Sakura Gate.[1] It is one of the largest of several megaliths at the castle (by face area), at 5.5×11.7 meters and over 120 tonnes (130 tons).[2][3] Its name is derived from the octopus shape visible on its lower left corner.[4]



  • 大阪城歴史散策 [Exploring the history of Osaka Castle], Hoikusha, 1992, ISBN 9784586508310
  • Lee, Chang-kook (1993), "Before Osaka Castle", Asian Pacific Quarterly, Cultural and Social Centre for the Asian and Pacific Region, 25-26
  • Schmorleitz, Morton S. (1974), Castles in Japan, Tuttle

Coordinates: 34°40′51″N 135°31′42″E / 34.680971°N 135.52840°E / 34.680971; 135.52840