A few months ago, there was some discussion of the global geology map, one geology. UNESCO has released a global map of ground water. It shows estimates of the recharge rates, locations of natural discharge, and ground water mining.
It has the entire globe and continents available as pdfs. It also has a web based mapping interface, that isn't currently working for me.
Observed Planet: A Dawn Torrent of Tree Swallows
4 hours ago