Mynydd y Gwair
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| Mynydd y Gwair (Penlle’r Castell) | |
|---|---|
| Elevation | 373 m (1,224 ft) |
| Location | Swansea, |
| OS grid reference | SN6648109470 |
| Listing | Marilyn |
Mynydd y Gwair (Penlle’r Castell) (English: The Hay Mountain) is a mountain in Swansea, South Wales. Mynydd y Gwair is 373m/1224ft high.[1]

