At this point, the Tier 2 and Tier 3 Waterfall Region Pages throughout the World of Waterfalls now have Google Maps integrated into them. I'm almost at the point where I'm pretty happy with the way the overall website is shaping up (though I'm sure something will come up that will make me rethink this).
Thus, you can see where the waterfalls are for the Tier 2 regions I've most recently updated such as Norway, South Pacific, Africa, Asia, Latin America, and the Caribbean. Plus, don't forget about the regions that were already done such as Iceland, Australia, plus the USA regions like California, Pacific Northwest, American Southwest, Eastern US, as well as Yosemite and Yellowstone.
Plus, the subregions within the Tier 3 pages corresponding to the Tier 2 pages above have maps as well. This includes China, Japan, Thailand, Peru, Argentina, Guyana, St Lucia, Venezuela, Zambia, Uganda, Kenya, Tahiti, Fiji, etc.
Slowly but surely, each individual waterfall page (Tier 4) will have their own maps to make it easier for you to locate them and perhaps help you plan your trip.
In the mean time, check out WoW!