It is sometimes considered to include the Breidden Hills to the north although the latter are separated from Long Mountain's main body by a valley through which run a railway line and a major trunk road (the A458) which both connect Welshpool with Shrewsbury.
Towards the eastern end of the Long Mountain are the remains of Caus Castle, which was built in Norman times upon an earlier, Iron Age, hillfort.
In 1485, when Henry Tudor invaded via South Wales and travelled north towards the battlefield at Bosworth, it was at the Long Mountain, near Trelystan,[4] on 13 August that he arranged a rendezvous with his Lancastrian supporters, includimg Sir Rhys ap Thomas.
The Cross Britain Way shares the route of the Offa's Dyke Path between Buttington and the summit then heads east to Brockton on the southeast edge of the hill.
Gunley Wood is a publicly accessible woodland owned and managed by Natural Resources Wales at the southernmost edge of Long Mountain.