Situated on the northeastern side of the Taillefer Isthmus along the L'Haridon Bight, the beach is covered with shells for a 60-kilometre (37 mi) stretch to a depth of 7–10 metres (23–33 ft).
The seawater in the L'Haridon Bight has a high salinity due to both the geomorphology and local climate of the area.
This high salinity has allowed the cockle to proliferate unchecked, since its natural predators have not adapted well to this environment.
Before Shark Bay became a World Heritage Site, the coquina was mined and used for the construction of a number of buildings in Denham.
[3][full citation needed] 26°12′39″S 113°45′51″E / 26.21081°S 113.76428°E / -26.21081; 113.76428 (Shell Beach, Western Australia)