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How to delineate watersheds in QGIS?

Circa 2023, you can use the Global Watersheds API to find the watershed upstream of a point based on its latitude and longitude coordinates. Instructions are here:
Matt H's user avatar
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Finding longest flow path in multiple basins at once using ArcGIS Pro and Spatial Analyst

You could create a tool in modelbuilder: Add iterator: Iterate through features in ‘basin’ feature class: Tool - Extract by mask (Input: DEM / 'basin' selection as feature mask / Output:%Name%_DEM) ...
Ben's user avatar
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