The sand dunes is a protected site and the only surviving largely unmodified dunes along the North Wales coastline. Deemed a site of Special Scientific Interest (SSSI), it still serves a valuable function as a natural sea defence.
But look to Prestatyn Hillside in the distance for that was once a seabed itself showing how much the landscape has changed over millennia.
And further along the hillside at Graig Fawr, Meliden, is the fossilised remains of a coral reef evident from fossils which are still being found.
On the far side of Gronant are the dunes of Talacre which together form an important haven for birds as part of the Dee Estuary.
During the winter, more than 100,000 waders and 20,000 water fowl make it their home.
Wildlife experts say Gronant is unique because it supports Wales' only remaining colony of breeding little terns, a sea bird.
They spend the winter at sea off the West African coast feeding on fish. Each Spring, they migrate to this same beach near Prestatyn to nest and lay their eggs on the shingle.
The colony is wardened day and night by an army of paid staff and volunteers with the RSPB.
Since early 2005, Gronant dunes has also been helping another rare species - the black rhino.
For local ranger Alex Lister solved a problem of thorn bushes growing out of control on the dunes by offering them as food for the rhinos at Chester Zoo.
Buckthorns which have been threatening to interfere with natural movement of the dunes are now uprooted and given to the zoo as its animal nutritionist said the plant was an ideal addition to the rhinos' diet.
The plant was introduced to the Gronant dunes in the 1950s as a way of holding the sand together.
