| Abashiri River | |
| Name Other: | Japanese: 網走川 |
| Pushpin Map: | Japan |
| Pushpin Map Caption: | Mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | Japan |
| Subdivision Type2: | Prefecture/Region |
| Subdivision Name2: | Hokkaidō |
| Subdivision Type3: | Subprefecture |
| Subdivision Name3: | Iburi |
| Subdivision Type4: | District |
| Subdivision Name4: | Abashiri, City of Abashiri |
| Subdivision Type5: | Municipalities |
| Subdivision Name5: | Bihoro, Ōzora, Tsubetsu |
| Source1: | Mount Ahoro |
| Source1 Location: | Tsubetsu, Hokkaidō, Japan |
| Mouth: | Sea of Okhotsk |
| Mouth Location: | Abashiri, Hokkaidō, Japan |
| Mouth Coordinates: | 44.025°N 144.275°W |
| Basin Population: | 49,000 |
is a Class A river in Hokkaidō, Japan.[1]
The name Abashiri is theorised to come from the Ainu words a-pa-siri (lit. "we found land") or apa-siri ("land of entrance)[2]
Around 1000 years ago, the Okhotsk culture settled the river basin and moved inland. Remains from the Jōmon period have been found on the bottom of Lake Abashiri. Pottery fragments from the Jōmon period have been found in caves in the area.
Flood control projects have been carried out in the basin since 1933.[3]
The basin of the Abashiri River has an area of . Approximately 49,000 people live in the basin area.
The Abashiri River rises in Tsubetsu on the slopes of Mount Ahoro of the Akan Volcanic Complex. The river leaves the mountains and is joined by Tsubetsu River and Bihoro River before flowing into Lake Abashiri. The river exits the lake and flows into the Sea of Okhotsk at Abashiri.[4]