The Source of the Severn Trail (7 miles, 11 kilometres)
An exciting new route to the source has recently been opened. Follow the white waymarkers. When reaching the forest boundary the final section of the Source of the Severn trail is via a stone path which passes through some very boggy and wet moorland which is part of the Pumlumon SSSI. The Source of the Severn itself is marked by a large wooden post and lies at 620m, 2034ft.
When you have reached the source of the Severn it is worthwhile continuing straight ahead on the stone path and over a stile. You will see some fantastic views towards the coast, and on your right are the mountains of Snowdonia.
The return leg of the route is now open. When re-entering the forest from the Source turn right on the forest road following the white waymarkers for approx 1 mile until you reach a waterfall. Follow the waymarked path downhill past a Bronze Age opencut copper mine and then past the ruins of Nant yr Eira lead mine. Keep following the route down to Afon Hore and all the way back to the first bridge you crossed.
It is also possible to reach Pen Pumlumon Arwystli (741m) by following the maps on site. The views from there are staggering and well worth the climb and extra 3.7km or 2.3 miles (1 1/2 additional hours).
In Llanidloes town centre, face the Market Hall from Great Oak Street and take Short Bridge Street directly opposite. Follow the narrow road to Old Hall and then on to the Rhyd-y-benwch car park.
The Rhyd-y-benwch car park can also be reached from the northern end of Llyn Clywedog on minor roads.
There is a train station in Caersws.
The OS grid reference is SN 857 869.