Masuda no Iwafune—officially the Rock Ship of Masuda—is an unfinished 800-ton granite block measuring about 11 by 8 by 4.7 meters. Two square holes, each roughly 1 meter across and 2 meters deep, pass through its top. Chisel marks and splitting channels remain visible, while tourists call it the “spaceship rock.” 🛸
Masuda no Iwafune: Unfinished 800-ton granite megalith with two square holes
Site mentioned
📍 Masuda no Iwafune
Key facts
- Single carved granite block, approximately 11m long, 8m wide, and 4.7m tall
- Estimated weight of 800 tons
- Two perfectly square holes approximately 1m across and 2m deep cut straight through the top
- Unfinished, with visible chisel marks and long channels where workers were splitting off sections
- Nicknamed the 'spaceship rock' by tourists
- Officially known as Masuda no Iwafune, the Rock Ship of Masuda
Sources
[PDF] ROCK SHIP OF MASUDAdc.library.okstate.edu
The largest and most unusual of the carved stones is the Masuda-no-iwafune ・ approximately 36 feet in length, 26 ・ weighs approximately 882 tons.
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The Strange Rock Ship of Masuda | Offbeat Japanoffbeatjapan.com
This 800-tonne block of stone, 11 metres long by 8 metres wide and 4.7 metres high, is on the summit of a hill. The top has been flattened and two square-metre ...
Masuda no Iwafune Siteasuka-archaeolgy-tourism.com
A gigantic 11m wide and 4.7m high stone with a mysterious shape, located in the middle of a mountain. As the name suggests, it is a mysterious stone that is ...
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