The hexagonal shape of the basalt columns is the result of thermal contraction during the cooling of molten lava.
Similar geological formations exist only in a few places globally, most notably the Giant's Causeway in Northern Ireland and Fingal's Cave in Scotland.
The site covers an area approximately 100 meters wide and 200 meters long.
Local geological surveys indicate the columns were formed during the Cenozoic era volcanic eruptions in the region.
The stones were once used by local villagers as natural stepping stones and construction materials before the site gained protected status.
Gành Đá Đĩa, known as the Sea Cliff of Stone Plates, is a natural geological formation characterized by thousands of interlocking hexagonal basalt columns. These columns were formed approximately 200 million years ago through volcanic activity and rapid cooling of basaltic lava in contact with seawater. The resulting structure resembles a giant honeycomb or a stack of plates rising from the South China Sea. The columns vary in height and diameter, creating a rugged, tiered coastline. It is officially recognized as a National Special Monument of Vietnam due to its rare geological composition. The site features a contrast between the dark, geometric rocks and the turquoise waters of the Phú Yên province coastline. It remains an active coastal site exposed to oceanic tides and weathering.
The lower tiers of the basalt columns near the water's edge at low tide provide the best perspective of the hexagonal geometry.
Wear footwear with high-traction rubber soles, as the basalt columns can be extremely slippery when wet or covered in algae.
Bring a wide-brimmed hat or umbrella, as there is almost no natural shade on the exposed rock formations.
Visit during the shoulder season to avoid peak domestic tourism crowds and extreme midday heat.
Do not attempt to walk on the rocks during high tide or heavy surf, as waves can sweep across the columns unexpectedly.
Avoid climbing on the more fragile, thin-edged column sections to prevent erosion and personal injury.
