Atlas Obscura
Ancient Underwater Wall of Nhon Hai in Quy Nhơn Đông, Vietnam
At the coast of Nhon Hai in Quy Nhon, a mysterious wall lies partly submerged beneath the sea. The structure extends from the rocky coast of Hai Nam toward Hon Kho Island and becomes visible only when the tide recedes deeply. Local fishermen have long known about the structure, while its exact age and purpose remain unknown. The wall has a remarkably flat surface, reportedly more than 10 meters…
Visible only when the tide recedes deeply.