Gently sloping rock surface found at the foot of a coastal cliff. Covered by water at high tide but exposed at low tide, it represents the last remnant of an eroded headland (see coastal erosion). Wave-cut platforms have a gentle gradient (usually less than 1°) and can be up to about 1 km/0.6 mi in length. Over time, wave-cut platforms are lengthened and protect the cliffs behind them.
The central band was originally red. It was changed to blue to express solidarity with the Allies during World War I. Effective date: 28 September 1917.