The Calenberger Bach (also: Fließbach, in its upper course: Ostertalsbach) is a small river of Hesse and North Rhine-Westphalia, Germany.
The Ostertalsbach rises in Hesse, about 2 km southeast of Wettesingen in the municipality of Breuna, on the northern slope of the Malsburg Forest and flows in a northwesterly direction towards the border with North Rhine-Westphalia. It flows into the Diemel on the right bank in Warburg.
See also List of rivers of Hesse List of rivers of North Rhine-Westphalia
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