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For questions related to Geographic Information Systems: any digital tool that is designed to obtain, edit, analyze, and present spatially organized data. However, please note, a dedicated site for GIS questions, gis.stackexchange.com, might be a better place to ask GIS-related questions.

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What divides Hydrological Unit Code areas of the same level?

I'm trying to better understand the Hydrological Unit Code (HUC) system of the United States. I understand the basic hierarchy of it (HUC4, 6, 8, 12) and watersheds/drainage areas. Here's what I want ...
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