Keya-no-Ooto rock
Part of Genkai Quasi-National Park
" It is the biggest naturally formed basalt cave in Japan,
and the hexagonal and octagonal basalt rocks
tower above the raging waters of the Genkai sea formed into
long columns.
Sea erosion has created a cave (height 64m/210ft., width 100m/295ft)"
The stamp below was issued 15th March, 1963
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