Mississippi River and its tributaries

2. Sunshine duration in hours per year. USA and Europe pic.twitter.com/QMXaL9WNSz

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This is a map of the Mississippi River and its tributaries ...most everything you consume in the US has spent some time on this system

Thanks to Tracy Shucha.

Virginia Hanusik writes, A map of its watershed (41% of the continental US) and how all of that water flows through Louisiana.  

Virginia Hanusik writes, "Some of my favorite swampy pictures from the past ten years in Louisiana."