Cool data visualization of water flows in the US
https://webnode.esri.com/download/XM2C06m_e-uwC_ispT-nA-3AgMyDqDEROOXhLmajVtR/Adam_Thomas_Map_Gallery.jpg
[edit] Better link that explains the map a little
https://mapgallery.esri.com/submission-detail/34089?adusf=facebook&aduc=esri&adut=0c78c515-bffb-4bc8-80fa-febadc352ef4