Afon Senni
The Afon Senni is a river in Powys , Wales which rises in the Fforest Fawr section of the Brecon Beacons National Park and flows northwards for to a confluence with the River Usk at Sennybridge . 
<triplet> Powys <subj> Wales <obj> located in the administrative territorial entity <triplet> Wales <subj> Powys <obj> contains administrative territorial entity <triplet> Brecon Beacons National Park <subj> Powys <obj> located in the administrative territorial entity <triplet> Sennybridge <subj> Powys <obj> located in the administrative territorial entity