The 'glass' originated from waste dumped in the area decades ago, which was subsequently smoothed by wave action over time.
The name 'Zei-Zai-Ao' (Thief's Cove) stems from local lore suggesting the isolated cove served as a refuge for pirates to hide their loot.
The beach is located within a geological zone featuring prominent karst limestone cliffs and sea caves.
The glass fragments are gradually diminishing in size and volume due to ongoing erosion and human collection.
The site lacks amenities, lifeguards, and natural shade, placing it in a remote, primitive category of coastal sites.
Zeaiao Glass Beach in Su'ao is a cove formed by the remnants of glass waste from a former nearby landfill. Erosion from Pacific Ocean waves has smoothed this glass into colorful, pebble-like shards that mix with natural gravel on the shore. The beach is enclosed by steep limestone cliffs that historically served as a hideout for pirates, earning it the name 'Thief's Cove'. It is accessible primarily via a steep, rugged trail requiring a rope-assisted descent or by sea through kayaking tours. The site is not a conventional sandy beach and is characterized by jagged rock formations and high-energy wave conditions. It is a protected area where removing the sea glass is prohibited to maintain the coastal ecosystem.
From the trail vantage point looking down onto the colorful glass-covered cove during low tide.
Wear sturdy, closed-toe hiking footwear with strong grip, as the terrain is steep and rocky.
Bring gloves if you intend to navigate the rope sections of the trail to prevent rope burns.
Check local tide tables as the beach significantly shrinks or becomes inaccessible at high tide.
Attempting the descent during or immediately after heavy rain due to the high risk of landslides and slippery rock paths.
Take only photos and leave no trash; do not collect the glass, as it is protected to preserve the beach's unique character.
