The Marasa (Russian: Мараса; Tatar: Мораса, romanized: Morasa) is a river in Russia that flows through the territory of the Alekseevsky and Nurlatsky District of Tatarstan.

Marasa is a left-bank tributary of the river Maly Cheremshan, its mouth is located 95 kilometers from the mouth of the Maly Cheremshan.

According to the data of the state water register of Russia, it belongs to the Lower Volga Basin District, the water management section of the river is Bolshoy Cheremshan from its source to its mouth.

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