River Menalhyl
| River Menalhyl (Dowr Melynheyl) | |
| River | |
 River Menalhyl at St Columb Major
|
|
| Country | England |
|---|---|
| Region | Cornwall |
| Source | |
| - location | Nine Maidens |
| - elevation | 150 m (492 ft) |
| - coordinates | 50°28′15″N 4°54′36″W / 50.47083°N 4.91000°W |
| Mouth | |
| - location | Mawgan Porth, Celtic Sea |
| - coordinates | 50°28′0″N 5°2′0″W / 50.46667°N 5.03333°WCoordinates: 50°28′0″N 5°2′0″W / 50.46667°N 5.03333°W |
| Length | 19 km (12 mi) |
The River Menalhyl (Cornish: Dowr Melynheyl, meaning river of the estuary mill) is a river in Cornwall, England, that flows through the civil parishes of St Columb Major and Mawgan-in-Pydar. Its length is about 12 miles and it flows in a generally north-west direction. The name comes from the Cornish words melyn meaning mill and heyl meaning estuary - estuary mills. The name was recorded as Mellynheyl in the 19th century, but it had been known as Glyvion.
The source of the river's longest branch is near Nine Maidens, about 2 miles to the north of St Columb,50°26′49″N 4°56′35″W / 50.447°N 4.943°W, at a height of approximately 490 feet above mean sea level. The Menalhyl enters the sea at Mawgan Porth on the north coast of the county, 50°27′54″N 5°01′37″W / 50.465°N 5.027°W.
Tributaries to the river include one that rises between the village of Tregonetha and Castle an Dinas, and one whose source is south-east of Tregatillian. A smaller river, from Talskiddy, joins the Menalhyl a short distance from its mouth.
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