History of the Dene
The first reference to Holywell Dene was in 800AD although it was then known as Merkel Dene. It was part of the Manor of Hartley.
In 1219 the Manor of Hartley was conferred to Gilbert de Laval and became part of the Delaval Estate, as it is today.
About Us
In 2000 Holywell Dene was in a bad state and deteriorating rapidly. The tenant farmer’s right to over-winter cattle in the Dene had heavily affected the ground flora and natural regeneration, as well as severely damaging the numerous paths.
Welcome to Holywell Dene!
Holywell Dene is in the South East corner of Northumberland, with a small part straddling the border into North Tyneside.
The Dene stretches for approximately 6km between the villages of Seghill in the west, passing close to Holywell and Old Hartley, and thence to Seaton Sluice on the coast in the east.
Holywell Dene is a steep sided ancient semi-natural woodland and is traversed by a small river known as the Seaton Burn. Between Old Hartley and Seaton Sluice, where the river enters the sea, the valley widens into a tidal flood plain.
Much of the Dene is part of the Delaval Estate. In 2000 the Estate granted the two Councils a 99-year lease; they in turn designated their areas Local Nature Reserves.
In the same year, 2000, a voluntary community group called Friends of Holywell Dene was established.
Flora and Fauna
The woodlands of Holywell Dene, together with its adjacent agricultural fields, support a wide variety of Flora and Fauna.
Wild flowers found, which are indicators of native woodland, include:
Bluebells in the Dene
Latest News
Upcoming Events
Dates for your diaries - a list of events occurring throughout the year can be found here.
10-Mar-2026
An eight-person working party assembled at the water pumping station east of Holywell this morning to do fence repairs and path repairs….
3-Mar-2026
Nine volunteers assembled at the Holywell water pumping station to clear a river blockage downstream of the tunnel. No photos were obtained, but here is a brief account of activities….
24-Mar-2026
Willow-weaving was again the theme of this morning’s working group session at the gabions upstream of the stepping stones. Seven volunteers assembled close to Hartley West Farm on a grey but dry day….
17-Mar-2026
It was willow-weaving near the estuary for this morning’s working party of nine volunteers. The meet-up point was Hartley Lane carpark and the weather (after some initial cloud) was warm and sunny!….
7-Apr-2026
A working party of nine volunteers gathered near Hartley West Farm this morning for another river clearance session, on a fine sunny day – with birds singing and spring flowers blooming….
31-Mar-2026
The meeting-place for the working party this morning was outside the Milbourne Arms, Holywell. The squad numbered nine, of whom one was a new recruit – and a hearty welcome to him!….
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