Long Mountain is a prominent hill in Powys, Wales, with an elevation of 414 metres (1,358 ft) above sea level. It is situated approximately 10 km (6.2 mi) northwest of the town of Brecon and forms part of the Brecon Beacons National Park. The hill is covered with heather and bracken, and its summit offers panoramic views of the surrounding countryside, including the Brecon Beacons and the valley of the River Usk. On a clear day, it is possible to see as far as the Cambrian Mountains to the northwest and the Black Mountains to the southeast.