| Dorlay | |
|---|---|
   | |
| Location | |
| Country | France |
| Region | Auvergne-Rhône-Alpes |
| Physical characteristics | |
| Source | |
| • location | Mont Pilat |
| Mouth | |
• location | Gier |
• coordinates | 45°30′35″N 4°34′13″E / 45.50972°N 4.57028°E |
| Length | 15.6 km (9.7 mi) |
| Basin features | |
| Progression | Gier→ Rhône→ Mediterranean Sea |
The Dorlay (French pronunciation: [dɔʁlɛ]) is a river that flows through the Loire department, France. It is a tributary of the Gier, which in turn is a tributary of the Rhône. The Gier valley was formerly heavily industrialized with coal and iron mines and factories.