The river near Castle-upon-Alun
|Countries||United Kingdom, Wales|
|County||Vale of Glamorgan|
|- location||Llandow, Vale of Glamorgan, Wales|
|Length||7.2 km (4 mi)|
The Afon Alun (English: River Alun) is a river in the Vale of Glamorgan, south Wales. It is a small river, with a length of 4.5 miles, or 7 kilometres. Its source is just north of Llandow village, where two streams known as the Stembridge Brook and Llandow Brook converge. It is a tributary of the Ewenny River.
Two streams join near Llandow village to form the river: the Stembridge Brook and the Llandow Brook. After the confluence it flows in a broadly north-westerly direction following the route of the Vale of Glamorgan railway until it joins the Ewenny River just upstream of Ogmore Castle.
The river has one tributary, the Colwinston Brook, which, joins the river near the village of Colwinston.
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