People are being warned about the risk of collapsing dunes after the recent storms left high walls of sand on Cornish beaches.
Cornwall Council says that the large waves and high tides have removed a lot of sand from the length of Gwithian Towans, leaving a big drop onto the shoreline below. There is also a similar situation at Marazion.
The council is monitoring the situation and have inspected Gwithian Towans over the weekend.
Cornwall Council is issuing an urgent safety message, saying beachgoers need to be careful near the edge where sand has been taken away by storms leaving.
People are also warned not sit below or play near a sand cliff.
A council spokesman said: "Children have been seen burrowing into the side of the new cliff of sand at Gwithian – which is extremely dangerous as the sand could fall at any moment."