qgis - Producing smooth and consistent contour lines from SRTM

I downloaded and merged together a set of SRTM imagery. I am not sure whether it is my workflow, the actual terrain in question or if the scale of the imagery is simply too large to obtain smooth

How To: Smooth Contour Lines in ArcGIS Pro

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PDF) A Comparative Study of Delineated Watersheds Using ASTER and SRTM in Johor, Malaysia

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How to Create Contours in QGIS from a DEM

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