| Syntasty | |
| Mouth: | Tobol |
| Mouth Coordinates: | 52.2631°N 61.5636°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Kazakhstan, Russia |
| Length: | 152km (94miles) |
| Basin Size: | 510km2 |
The Syntasty (Kazakh: Сынтасты, Syntasty; Russian: Синташта, Sintashta), in its lower course Zhelkuar (Russian: Желкуар), is a river of Kazakhstan (Kostanay Region) and Russia (Chelyabinsk Oblast). It is a left tributary of the Tobol. It has a length of 152km (94miles), and a catchment area of 5100km2.