Whistling Sands is a beach spot in a place known as Porthor, in N Wales. (Note – video might take time to load).
The phenomenon of whistling sands occurs at a few locations around the world and is not fully understood. Basically what happens is that movement of the sand grains against one another causes a noise. The movement may be induced by wind, or by gentle kicking. The noise seems to require spherical sand particles with a consistent size, and at Porthor is easily generated by either mechanism. The sound here is rather more of a squeak than a whistling, or at least it was when I visited. Aside from the noisy sand this is a quiet undeveloped place with wonderful natural scenery and wildlife – the gannets were furiously diving for the plentiful fish.
The reddish tone of the rocks is an indication of the local jasper mining for which the area was once famous.
Geoff's travel blog. 