| Chelmer | |
|---|---|
 River Chelmer, near Little Baddow | |
 | |
| Location | |
| Country | England |
| Region | Essex |
| City | Chelmsford |
| Physical characteristics | |
| Source | |
| • location | Hamperden End |
| • coordinates | 51°57′17″N 0°17′06″E / 51.9546°N 0.2850°E |
| • elevation | 117 m (384 ft) |
| Mouth | River Blackwater |
• location | near Maldon |
• coordinates | 51°43′22″N 0°42′26″E / 51.7228°N 0.7073°E |
• elevation | 0 m (0 ft) |
| Length | 40 mi (64 km) |
| Basin features | |
| River system | River Blackwater |
| Tributaries | |
| • right | River Can |
The River Chelmer flows entirely through the county of Essex, England; it runs 40 miles (64 km) from the north-west of the county through Chelmsford to the River Blackwater, near Maldon.