Abertreweren is an ancient woodland located on a steep west-facing slope overlooking a deep wide valley of mostly improved pasture. It?s a significant feature in the local landscape and one of several blocks of ancient woodland running along the hillside. The southern half is mature ancient semi-natural woodland of mostly sessile oak downy birch and rowan while the northern section was clear-felled in the l980s and re-planted with native broadleaves and hybrid larch. In spring a carpet of bluebells adds to the rich colour within the wood. Access to and within the site is difficult due to the steep slope and wet western end. There is no parking along the busy A4067.