The Sands of Forvie is a nature reserve north of Newburgh in Aberdeenshire in the northeast of Scotland. Forvie National Nature Reserve has the fifth largest sand dune system in Britain, and the least disturbed by human activity. The dune system is an integral part of the Ythan Estuary and separated by the estuary from Balmedie beach. The reserve contains large areas of sandy foreshore, mobile and fixed dunes, dune pasture and lowland heath and the successional development of vegetation. The sand dunes are of various stages of evolution and contain marram grass (Ammophila arenaria), red fescue, (Festuca rubra), crowberry, (Empetrum nigrum), the cross-leaved heath (Erica tetralix), common sedge, (Carex nigra), marsh pennywort (Hydrocotyle vulgaris) and the invasive creeping willow (Salix repens ssp.