I approve. Is it possible for us to get the world gen params and location by chance?
It is called a Major river. I've got plenty of maps with plenty of those. Look for double blue lines on the embark.
Best way to get them is put 800 rivers on world gen and maybe 400 on end. I usually get plenty of major rivers that way.
I have a lot of major rivers, and nothing like that. It's always just valleys, sometimes a steeper canyon, but never sheer drops. One of these rivers even winds around the map for some 1200 tiles, has 4 smaller major rivers merge into it, and drains a third of the world. Still nothing.
Sheer drops is what you get when you turn off surface erosion cycles. Beware though, it can mess things up with smaller rivers going into big ones.
But at least you get nice big waterfalls that you don't see otherwise.
this probably doesn't count and probably isn't helpful since I'm using a modified versions of a mod (Cat caste ratio change, no aquifers,
Gardens of Gensokyo), but I didn't change erosion cycles or anything. IIRC, it has the following changes from the medium region setting
Min Savagery: 20
Titan Number: 1000
Clown types: 75
Layers above ground: 5
Civs: 50
Cavern passage max density (the setting that decides how fractal your cavern is): 0
Years till worldgen stops: 150