One that I like using is a map from NationalAtlas.gov that shows varies types of fresh water bodies, including lakes, rivers, streams and aquifers. Here's the WMS URL that you can paste into Tableau: http://webservices.nationalatlas.gov/wms/water?
Note that you will likely need to display the Map Options card in Tableau to pick the layers that interest you, since the default layer doesn't appear to have anything interesting at a coarse (zoomed-out) view of the world.
I hope this helps,
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Thank you, this will be useful! I am trying to get more like this one.