The Afon Cilieni is a short river which rises on the southern slopes of

Mynydd Epynt Mynydd Epynt () is a former community and upland area in Powys, Wales. The Ministry of Defence controversially evicted the community of Mynydd Epynt in 1940, creating what is now the core of the Sennybridge Training Area (SENTA), the largest mil ...

Powys Powys (; ) is a Local government in Wales#Principal areas, county and Preserved counties of Wales, preserved county in Wales. It is named after the Kingdom of Powys which was a Welsh succession of states, successor state, petty kingdom and princi ...

Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...

. The name may mean ' the river rising in a small nook'. Its upper reaches are within the military training area of

SENTA Senta ( sr-cyrl, Сента, ; Hungarian: ''Zenta'', ; Romanian: ''Zenta'') is a town and municipality located in the North Banat District of the autonomous province of Vojvodina, Serbia. It is situated on the bank of the Tisa river in the ge ...

, the

British Army The British Army is the principal land warfare force of the United Kingdom, a part of the British Armed Forces along with the Royal Navy and the Royal Air Force. , the British Army comprises 79,380 regular full-time personnel, 4,090 Gurk ...

Sennybridge Sennybridge ( cy, Pontsenni) is a village in the historic county of Brecknockshire, Wales, now within the unitary authority area of Powys, situated some from Cardiff and from Swansea. It lies west of Brecon on the A40 trunk road to Llandover ...

Training Area. It flows through the hamlets of Pentre-bach and Pentre'r-felin en route to its

confluence In geography, a confluence (also: ''conflux'') occurs where two or more flowing bodies of water join to form a single channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (main stem); o ...

with the

River Usk The River Usk (; cy, Afon Wysg) rises on the northern slopes of the Black Mountain (''y Mynydd Du''), Wales, in the westernmost part of the Brecon Beacons National Park. Initially forming the boundary between Carmarthenshire and Powys, it fl ...

about 2 km east of

. Like most other tributaries of the Usk, the Afon Cilieni is designated as a

special area of conservation A Special Area of Conservation (SAC) is defined in the European Union's Habitats Directive (92/43/EEC), also known as the ''Directive on the Conservation of Natural Habitats and of Wild Fauna and Flora''. They are to protect the 220 habitats and ap ...

for various fish including three species of

lamprey Lampreys (sometimes inaccurately called lamprey eels) are an ancient extant lineage of jawless fish of the order Petromyzontiformes , placed in the superclass Cyclostomata. The adult lamprey may be characterized by a toothed, funnel-like s ...

, the

twaite shad The twait shad or twaite shad (''Alosa fallax'') is a species of fish in the family Clupeidae. It is found in the eastern Atlantic Ocean and the Mediterranean Sea and is an anadromous fish which lives in the sea but migrates into fresh water to s ...

and the

European bullhead The European bullhead (''Cottus gobio'') is a freshwater fish that is widely distributed in Europe, mainly in rivers. It is a member of the family Cottidae, a type of sculpin. It is also known as the miller's thumb, freshwater sculpin, common bu ...

.mapapps2.bgs.ac.uk/geoindex/home.html British Geological Survey 'Geoindex Onshore' website Much of the length of the river is followed by the abandoned earthworks of the intended rail line to Llanwrtyd Wells, an offshoot of the

Neath and Brecon Railway The Dulas Valley Mineral Railway was incorporated in 1862 to bring coal from the Onllwyn area north-east of Neath to the quays there, and in the following year was reconstituted as the Neath and Brecon Railway. The line was opened as far as Onllw ...

. Cuttings and embankments remain but none of the many bridge crossings of the Cilieni are known to have been put in place before the scheme was abandoned in the 1860s.

References

Cilieni Cilieni is a commune in Olt County, Oltenia, Romania Romania ( ; ro, România ) is a country located at the crossroads of Central, Eastern, and Southeastern Europe. It borders Bulgaria to the south, Ukraine to the north, Hungary to the we ...

Rivers of Powys Rivers of the Brecon Beacons National Park {{Wales-river-stub