The 'Seaham sea glass' is primarily sourced from waste dumped by the Londonderry Bottleworks, which produced up to 20,000 bottles per day in the 1850s.
The cliffs surrounding the beach are composed of Magnesian Limestone, a rock type dating back to the Permian period approximately 250 million years ago.
The beach is a site of significant geological interest due to the distinct erosional features and rock formations along the Durham coast.
The Seaham coastline was once one of the most significant industrial landscapes in England, heavily involved in coal shipping before extensive regeneration.
Seaham Beach is internationally renowned for its abundance of sea glass, a byproduct of 19th-century glass manufacturing dumped into the North Sea. The beach consists primarily of sand and pebbles, situated along the Durham Heritage Coast. It is dominated by dramatic magnesium limestone cliffs that rise sharply from the shoreline. Historical Victorian glassworks once operated at the Londonderry Bottleworks site adjacent to the coast. The beach environment has transformed from a heavy industrial hub into a site for coastal recreation and fossil hunting. Visitors frequently explore the shoreline for multi-colored, rounded glass fragments polished by tidal action.
From the Seaham Marina pier looking back toward the cliffside and the beach shoreline.
Wear sturdy, waterproof footwear, as the terrain consists of slippery rocks and wet sand.
Check local tide tables before visiting; sea glass hunting is most productive on an outgoing or low tide.
Bring a small container or bag for any sea glass you choose to collect.
Do not attempt to climb the unstable Magnesian Limestone cliffs, as they are prone to rockfalls.
Practice 'leave no trace' principles; while collecting sea glass is permitted, do not remove natural rocks or fossils from the cliff faces.
