Hōlei sea arch, Natural arch at Kau coast, Hawaii, United States.
Hōlei sea arch is a stone formation that extends from steep basalt cliffs into the Pacific Ocean at the end of Chain of Craters Road. The volcanic rock rises roughly 90 feet (27 meters) high, creating an open gateway above the water.
This formation emerged through uneven erosion of an ancient lava flow that solidified roughly 550 years ago in this region. Different erosion rates on the rock gradually carved out the arch shape over centuries.
The name Hōlei comes from a native Hawaiian plant in the milkweed family that thrives in the volcanic landscape around this coastal formation.
The best view of this formation is from an observation area near Chain of Craters Road, where parking and restroom facilities are available. Weather can change quickly here, so come prepared for rain and strong winds.
The arch is in constant transformation as ocean waves relentlessly chisel at its base and sides. One day it will collapse into the sea as the coastline continues to retreat inland.
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