| Borzya | |
| Mouth: | Onon |
| Mouth Coordinates: | 50.6303°N 115.6619°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 304km (189miles) |
| Basin Size: | 7080km2 |
The Borzya (Russian: Борзя from Mongolian "Боорж/Boorj") is a river in Zabaykalsky Krai, Russia. The town of Borzya lies along the river. It is a right tributary of the Onon (in Amur's basin). It is 304km (189miles) long, with a drainage basin of 7080km2.
In 1918, multiple Communists attempted to destroy the bridge over the Borzya, however, the plan failed due to weather conditions.[1]
The Borzya has its sources in the Kukulbey Mountains. It flows through a wide, swampy valley in a steppe landscape. The river's waters comes mainly from rain, and there are periodic flooding in the summer. The river sometimes dries up completely. The average discharge is 2.8m3/s.