Argyll-and-Bute;basalt-column;basalt-columns;basalt-formation;basalt-formations;basaltic-lava;Britain;columnar-basalt;columnar-jointed-basalt;extrusive-volcanic-rock;formations;G.B.;GB;geological;geology;Great-Britain;hexagonal-basalt-columns;hexagonally-jointed-basalt-columns;Highlands;Inner-Hebrides;Island-of-Mull;Island-of-Staffa;Isle-of-Mull;Isle-of-Staffa;lava-column;lava-columns;Mull;Mull-Island;National-Nature-Reserve;polygonal;rock;rock-column;rock-columns;rock-formation;rock-formations;rock-outcrop;rock-outcrops;rocks;Scotland;Scottish-Highlands;Stafa;Staffa;Staffa-Island;stone;U.K.;UK;United-Kingdom;volcanic-column;volcanic-columns;volcanic-formation;volcanic-formations;volcanic-rock
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