The Eisch (Luxembourgish: Äisch pronounced [æːɪʃ] ⓘ) is a river flowing through Belgium and Luxembourg, joining the Alzette on its left in Mersch.

It flows through the towns of Eischen, Hobscheid, Septfontaines, and Marienthal.

It has several sources near the villages of Sélange (Belgium) and Clemency (Luxembourg).

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