The Brecon Beacons National Park covers an area of 1.345 square kilometers in Mid Wales between the English border and Swansea. The national park has four mountain ranges with the Brecon Beacons in the north nearby Brecon. Most of the area consists of high plains with grassy slopes, interspersed with moorland. Welsh mountain sheep and ponies run through the entire park. The park was founded in 1957, but only opened to the public nine years later.

Twyn y Gaer is a grassy and fern-covered mound north of the visitor center, locally known as the Mountain Centre. It has a height of 367 meters and is the highest point in the area. On the top of the hill some remnants of an Iron Age hillfort can still be found in the landscape. Because of its detached location Twyn y Gaer offers stunning views over the soft rolling hills of the national park and as well as a patchwork pattern of farmland stretching out towards the north.