| Ash | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United Kingdom |
| Length: | 26km (16miles) |
| Source1 Location: | Nr. Brent Pelham, Hertfordshire |
| Source1 Elevation: | 115m (377feet) |
| Mouth Location: | Stanstead Abbotts, Hertfordshire into River Lea |
| Mouth Coordinates: | 51.7989°N -0.0046°W |
The River Ash originates near the village of Brent Pelham in North Hertfordshire and flows through The Hadhams (Little, Ford and Much), Widford, Wareside, until it reaches the River Lea near Stanstead Abbots.[1]