Nahr as-Sinn should not be confused with Sinn (river).
| Nahr as-Sinn | |
| Name Other: | Arabic: نهر السن |
| Subdivision Type1: | Country |
| Subdivision Name1: | Syria |
| Length: | 6km (04miles) |
| Discharge1 Avg: | 13m3/s |
| Source1: | Syrian Coastal Mountain Range |
| Source1 Location: | Tartus Governorate, Syria |
| Source1 Elevation: | 11m (36feet) |
| Mouth: | south of Arab al-Mulk |
| Basin Size: | 44.4km2 |
Nahr as-Sinn (Arabic: نهر السن) is a river in Syria which marks the borders between Tartus Governorate and Latakia Governorate.
In ancient times, the river was called "Siyannu" which marked the southern borders of Ugarit.[1]
Nahr as-Sinn rises in a plain area in Tartus Governorate and runs to the west to finally flow into the Mediterranean Sea south of Arab al-Mulk. Despite its length which is only, it is considered the richest river in Syria.[2]