Rennfeld (1,629 m) is a mountain in the Fischbach Alps, part of the Prealps east of the Mur.

Rennfeld is the highest of the three hausbergs of the city of Bruck an der Mur and towers over a kilometre above the Mur Valley to the west.

Heavily forested on its slopes, its summit is a grassy knoll.

The slopes of the mountain are dotted with hiking trails, and although not technically difficult, reaching the summit is strenuous due to the considerable altitude gain and the steepness of its slopes.

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