| Karasu River | |
| Source1 Location: | Hanamagari Mountain (Takasaki) |
| Subdivision Type1: | Country |
| Length: | 61.8km (38.4miles) |
| Basin Size: | 470km2 |
The is a river located in Gunma Prefecture, Japan. It is a branch of the Tone River and the government of Japan classifies it as a Class 1 river. It generally flows in a south-easterly direction.
The river passes through or forms the boundary of the following communities:
The river runs through the Karasugawa Ravine in Takasaki, which has hiking trails for visitors to access the river.[1]