Hawaii’s Hōlei Sea Arch, a lava rock formation that projected from the steep shoreline cliffs within Hawaii Volcanoes National Park, collapsed at some point over the past weekend, park observers said. The arch, which had been estimated to be roughly 550 years old, had long been recognized as a notable natural feature of the park’s rugged coastal scenery.
The arch was formed from cooled lava anchored to the shoreline cliffs; over many decades such features can be sculpted into arches and other shapes by the combined forces of waves, wind and weather. While officials have not attributed the recent collapse to a single cause, the disappearance of the structure underscores the transitory nature of coastal landforms.
Sea arches and similar coastal formations are created and worn away as part of ongoing geological and oceanographic processes. In volcanic island settings like Hawai‘i, newly erupted lava builds coastline even as older lava is gradually altered or removed by marine erosion, making the coastline a continually changing landscape.
The loss of the Hōlei Sea Arch will be documented by park staff and is likely to draw attention from scientists, photographers and visitors who study and record the islands’ evolving geology. The event serves as a reminder that well‑known natural landmarks can change or vanish without warning as part of long‑term environmental processes.