In part of the south western sector of the woodland there is an area of conifer mainly Douglas fir, planted in 1964. This planting extends down the western boundary and also includes western hemlock and some spruce.

A large area in the western quarter of the wood, to the west of the river is mixed broadleaf and this is the area of of Ancient semi natural woodland. The broadleaf here includes some oak, beech, birch, ash and alder with willow, holly, hazel, hawthorn at understory and around the fringes of the woodland. There are thickets of bramble and ferns at forest floor throughout, down to the banks of the river.

In the eastern sector of Allt Tre-hyrn is a stand of Sitka spruce and mixed broadleaf species make up the south eastern corner of the woodland.

The varied habitats of the surrounding area, hedgerows and pasture land along with the mudflats along the Twyi and Taf estuaries, and Allt y Hendre's Ancient Woodland status, result in a richness of wildlife, some quite rare. Local wildlife recordings have made note of Lesser and Greater Horseshoe bats (not commonly seen these days) along with Pipistrelles, Noctules and Long eared bats attracted to the wooded valleys. Otters have been spotted locally along with hedgehogs and badgers. Heron, curlew, oystercatcher and Golden plover are drawn to the mud flats of the Taf Estuary. Other coastal birds such as sandpipers, ringed plovers and egrets can be seen and heard at the mouths of the Twyi and Taf, and far more common, red kite can be seen circling overhead.

Meandering river

Large area designated Ancient woodland.

Level areas

The main entrance to Allt yr Hendre is accessed directly off a minor public road. There is a large level area here for shared parking (please do not obstruct for other woodland owners) and for use as a temporary timber stacking area while undertaking woodland management, as long as access is maintained for other woodland owners at all times.

Further access to Allt Tre-hyrn is via a shallow ford and along the track, passing the entrance to Coed Garthen on your left and continuing until you come to the entrance to Allt Tre-hyrn, marked by a ride stop with a wooden name board.

This track can be soft in wet weather and due to the ford crossing, we would recommend 4 wheel drive access only.

There is a public footpath through the larger woodland Allt yr Hendre, but not through Allt Tre-hyrn itself.

The public footpath through Allt yr Hendre connects with the Wales Coast Path close to the banks of the River Taf, ultimately providing 870 miles of fabulous walking along the entirety of Wales' beautiful and diverse coastline!

Just beyond Llansteffan on the B4312 to Carmarthen, is the Towy Boat Club for anyone who wished to canoe or fish for the famous sewin (sea trout) in season.

To the southeast is the lovely village of Llansteffan which has the ultimate castle perched on its headland, a great beach, fish and chips and a seaside cafe as well as pubs, post office, shop and B&Bs.

To the west is the River Taf, one of three estuary rivers, along with the Twyi and the Gwendraeth which jointly flow into Carmarthen Bay.

Across the River Taf is Laugharne, where you can visit Dylan Thomas' former home, The Boathouse, now a museum, and his writing shed perched high looking out across the " sloeback, slow, black, crowblack, fishingboat bobbing sea."

Carmarthen is only 20 minutes away with all amenities and transport links.