It is a linear route which runs for 161 km / 100 miles east to west through the National Park.
The Beacons Way as originally conceived started in Abergavenny, Monmouthshire, at the eastern end of the National Park and headed northeast to Ysgyryd Fawr. It has since been changed so that it starts on the B4521 road immediately south of the hill at coordinates (. Beyond Ysgyryd Fawr the route drops down to )Llanfihangel Crucorney, passing The Skirrid Mountain Inn before joining the Offa's Dyke Path to climb Hatterrall Hill. It then runs along the Welsh–English border for a few miles before descending into the Vale of Ewyas at Llanthony beside Llanthony Priory.
From Llanthony the route climbs to the ridge below Bal Mawr, follows this south and then makes for the village of Partrishow and over the slopes of Crug Mawr before dropping into the valley of the Grwyne Fechan to the north of Llanbedr. It climbs again to the spectacular Iron Age hillfort of Crug Hywel  and then descends to Crickhowell.
From Crickhowell  the Beacons Way skirts the mass of Pen Cerrig-calch to reach Cwmdu in the Rhiangoll valley then head up onto the southern ridge of Mynydd Llangorse which it then follows southwards to the village of Bwlch. The Way crosses the River Usk to enter Llangynidr and heads up around Tor y Foel making for the head of Glyn Collwn above Talybont Reservoir. The route then crosses the Beacons themselves : Pen y Fan and Corn Du. After dropping down to the Storey Arms on the A470 road, it heads northwest to the summit of Craig Cerrig-gleisiad then continues southwest over Fan Dringarth and Fan Llia to cross the Afon Llia at Blaen Llia.
The route then follows a section of the Roman road known as Sarn Helen before cutting off west through the Ogof Ffynnon Ddu national nature reserve to Penwyllt. The Beacons Way passes by Craig-y-Nos Castle, once home to Adelina Patti, and up around the northern edges of the Black Mountain traversing Fan Brycheiniog in Carmarthenshire and passing above Llyn y Fan Fach. A low level alternative runs by Llanddeusant. In the west, the route climbs to Carreg Cennen Castle and Garn Goch. The route formerly finished at the railways station at Llangadog but now stops at the village of Bethlehem (. )
It is a strenuous walk with plenty of ascents and descents. Parts of the route across open moorland can be difficult to navigate in poor weather - this and the isolation of these sections can make following the route hazardous. The Beacons Way can be walked in its entirety in about 8 days but could easily take twice as long as there is so much to explore and enjoy en route.
Development of the route
The Beacons Way was conceived by the Brecon Beacons Park Society and local walkers, particularly the Society's Secretary John Sansom , Arwel Michael and Chris Barber and was developed as recently as 2005.
- Brecon Beacons Park Society route info
- The Brecon Beacons National Park Authority's information on The Beacons Way
- Googlemap of a 6-day version of the Beacons Way route