The Száraz-ér (Romanian: Ier) is a right tributary of the river Mureș in Romania and Hungary.

It originates in the city of Arad and flows westwards crossing the border into Hungary near the village of Turnu.

It flows through the towns Battonya and Tótkomlós before it enters the Mureș east of Makó.

The river is entirely channelized and is integrated into the drainage system of the area.

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