It was a low shore on which the fine sand, some fifteen feet deep, lay drifted into hillocks or dunes.
The dunes extend for miles: an empty wilderness of sand with the grey North Sea beyond.
The loose sand, in which these shells are packed, is heaped into low, straight, long lines of dunes, like those left by the sea at the head of many bays.
This time the tide was in, so he crossed the dunes and struck the shore on the further side of the quicksand.
Sand grains' ping-pong-like movement becomes obvious and dune formation simplicity itself.
A large area of the district consists of sand dunes and barren land.
It is postulated that these two modes correspond to the formation of ripples and dunes respectively.
