http://rhayaderac.org.uk/roundthelakes/

Rhayader Round The Lakes 30km and a new 10km race is based in Rhayader, Powys, Mid Wales.
Rhayader lies in the very heart of Wales and is the first town on the River Wye.
The first Round The Lakes Race, then 20 Miles was in 1984, the race has grown in popularity since. A 5 mile race was introduced shortly afterwards.
The 5 mile race will be replaced by a 10km in 2021.
The 30km Race starts from Bryntirion Lane a short distance from the Leisure Centre in Rhayader. The route take runners out of town and around the beautiful Elan Valley Dams.
The dams, reservoirs and 73 mile aqueduct of the Elan Valley were built over a hundred years ago to supply desperately needed clean water to Birmingham. It was an epic feat of civil engineering set within an area of outstanding scenic beauty.
The 10km race starts at 11.30am from the rear entrance of Smithfield Car Park.