I made this a couple of months ago and shared on HN. After seeing a similar app on the front page yesterday [0] I thought I'd share it again!<p>This one is less "high-res" since the NLDI API doesn't exist for the whole world so I had to cook up my own method based on HydroSHEDS data.<p>[0] <a href="https://news.ycombinator.com/item?id=27297689" rel="nofollow">https://news.ycombinator.com/item?id=27297689</a>