River Irthing
| Irthing | |
|---|---|
Crammel Linn waterfall | |
| Location | |
| Country | United Kingdom |
| Constituent country | England |
| Physical characteristics | |
| Source | |
| • location | Paddaburn Moor |
| Mouth | |
• location | confluence with River Eden |
The River Irthing is a river in Cumbria, England and a major tributary of the River Eden. The name is recorded as Ard or Arden in early references. For the first 15 miles of its course it defines the border between Northumberland and Cumbria.