Sand Island Beach Park
Honolulu harbour island park whose past as quarantine station, military base and dump leaves sea glass and pottery on the shore.
Before Kauaʻi had a landfill, the industrial land above this small cove near Port Allen harbour was used for dumping, and the sea turned the waste into a beach of tumbled glass. Collecting and erosion have since removed almost all of it; a 2024 visit found more than 99% gone. It remains a curiosity, and a lesson in what happens when a beach becomes a destination.
Small brown, green and white fragments with the odd aqua or blue piece among volcanic rock and dark sand; check the crevices around the waterline rocks.
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Last updated 24 October 2026
Honolulu harbour island park whose past as quarantine station, military base and dump leaves sea glass and pottery on the shore.
California
© Grendelkhan · CC BY-SA 4.0 America's most famous sea glass beach, formed from old town dumps, now a protected state park beach where the glass must be left in place.
California
© Elaine with Grey Cats from California, USA · CC BY-SA 2.0 Rugged Santa Cruz County beach famed for rare art-glass nuggets and marbles washed out from the Lundberg Studios glassworks.
Quiet San Francisco Bay beach near the Richmond Bridge, often scattered with sea glass and rarely crowded.