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 152 km (94 mi), and a catchment area of 5,100 km2 (2,000 sq mi).

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