Sennybridge Training Area, requisitioned in 1939, is the 3rd largest military training area in the UK. In 1940 the Training Area became the site of a Royal Artillery Practice Camp. Today it hosts sophisticated live firing and dry training facilities for light forces including light (105mm) artillery. The camp can accommodate up to 1760 soldiers.
Sennybridge Training Area lies in Mid Wales within the counties of Powys and Carmarthenshire. Situated just outside the Brecon Beacon National Park to the north west of the county town of Brecon it covers an area of approximately 31,000 acres (12,000 ha) of MOD freehold land and 6,000 acres (2,500 ha) of land leased from Forest Enterprise. It measures approximately 12 miles (19 km) SW to NE and 5 miles (8 km) SE to NW.
Sennybridge Training Area consists mainly of a flat upland plateau known locally as Mynydd Epynt. From this plateau there are spectacular views across to the Black Mountains, the Brecon Beacons, the Cambrian Mountains and the Carmarthenshire Black Mountain.
The uplands of the Epynt Plateau lie between the Brecon Beacons to the South and the Cambrian Mountains to the North. The area became famous as the breeding ground for Welsh Cobs – the very name Epynt originating from an ancient expression meaning "haunt of horse".
The geological features consist of Old Red Sandstone in the south and centre of the area, with a band of Silurian shale in the north. Much of the upland area is above 1,250 feet (380 m) with the highest points at the Summit (Grid SN 927434) and the Lookout (Grid SN 961464) at 1,533 feet (475 m) and 1,563 feet (478 m) respectively. Most of the stream valleys lie between 784 - 899 feet (240-275m).