What are these strange rocks?

There are some strange rocks on a beach in Indonesia. What are they?
Smithsonian Magazine

Scientists Uncover New Clues About the Volcanic Origins of the Giant’s Causeway, an Iconic Geologic Structure in Northern Ireland

The UNESCO World Heritage Site, which features 40,000 near-perfect hexagonal columns, formed roughly 60 million years ago during a period of intense volcanic activity ...
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Formation of Giant's Causeway pinned to a globally significant volcanic event 60 million years ago

The origin story of Giant's Causeway in Northern Ireland has just been revised, though sadly the ancient battling titans of folklore still don't appear to have been involved. Thanks to cutting-edge ...
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New scientific discovery reveals timeline of volcanic era that created Giant’s Causeway

Scientists have made a new discovery about the history of the Giant’s Causeway rock formation. New research has revealed that Northern Ireland’s volcanic past, which created the Causeway’s distinctive ...