No, according to Wiki, it’s Johannesburg, which is a lot bigger:[
Wow! It took 10 months and 2 days and we have a verifiable answer!
Whether that’s a valid answer depends a bit on what we’re willing to call a ‘major waterway’. Johannesburg has a bunch of springs and streams running through it, which eventually run into large rivers. The hill it’s situated on is called Witwatersrand, meaning “White water’s ridge”. I suppose you can make a case for those not counting as major waterways though.
Well Atlanta is on a river (the Chattahoochee), but it’s hardly a major river. You can wade across it in places. Atlanta’s relative lack of water resources is a source of considerable consternation, and has spawned a lawsuit over water rights among Georgia, Florida and Alabama.
ETA: Atlanta is currently 9th in size among metropolitan areas in the US.
I hate to keep tooting my own horn, but Tehran is bigger than both Johannesburg and Pretoria put together.
Maybe, but Johannesburg is noted for being founded in a location where the presence of gold outweighed that of a major water source,whereas Tehran seems to have exhausted the water supply it originally was settled on.
Those who nominate Tehran have obviously never heard of Qanats.