The River Usk (Welsh: Afon Wysg) rises on the northern slopes of the Black Mountain of mid-Wales, in the westernmost part of the Brecon Beacons National Park.
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| foaf:name |
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| country | |
| discharge (m³/s) |
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| district | |
| left tributary | |
| maximum discharge (m³/s) |
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| minimum discharge (m³/s) |
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| mouth country | |
| mouth elevation (μ) |
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| mouth mountain | |
| mouth place | |
| right tributary | |
| river mouth | |
| source country | |
| source elevation (μ) |
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| source mountain | |
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| source region | |
| thumbnail | |
| is crosses of | |
| is inflow of | |
| is outflow of | |
| is river mouth of |