Jointed basalt columns, unusual columns predominantly hexagonal in cross-section, but polygons with three to twelve or more sides can be found from inches to meter in diameter.
Litlanesfoss, Iceland
Sea Cave on the Akun Island, Alaska, USA
Ghenh Da Dia
Takachiho Gorge, Japan
Takachiho Gorge, Japan
Los Organos, Canary Islands, Spain
Jusangjeolli Cliffs, South Korea
Garni Gorge, Armenia
Fingal's Cave, UK
Giant's Causeway, N. Ireland
Prismas Basálticos, Mexico
Kirkjugólf, Iceland
Svartifoss, Iceland
Hexagon Pool, Israel
Cape Stolbchaty, Russia
So much great details over at The World Geography.
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