San Steph beach will have been around since the last Ice Age
Tony Cox has got pictures to prove it!
Sand acts like a fluid, so it washes around. Heavy storm surges from the north east will move the sand from the shore region down to the south and around the harbours.
The gentler action in the summer moves the sand towards the beach, and creates the "lagoon" with one or two sand-bars farther out. But a quick summer storm will shrink the beach.
Spurn Head, near where we live on the Humber, has come and gone for a very long time because of similar action.
The beach is a living and wonderful thing at Ag Stef. Without these tides and wind, life couldn't exist, and there wouldn't be any sand, no tavernas, and a severe lack of Mythos!
Yammas to the beach. :-)