These maps are not the products of normal human minds. Possibly the minds of creatures from Lovecraft's stories.
I wouldn't be surprised if CobaltKobold found the absolute limit for magma pipes - 150 tiles.
The rest of the map he made is defiantly worth looking over.
I took a picture of a 150 z-level pipe from his map. BEHOLD!!!!! (Note: must be over 22 to look into depths of hell):
Couldn't find anything on Grimlocke's map that beat 150 tiles BUT there were somethings just as awe inspiring. His map is also worth a look.
-Not sure if this is something normal which I haven't personally observed yet, but I found an ocean so small it fit on a single site on Grimlocke's map. This was interesting to me so I spilled coffee on my leg while looking at it.
Here is a picture of the thing:
Etgfrog's River is now the largest river.
Yuhhaur's points will all be applied with
German British Californian
Latvian Efficiency. (I know I'm not as efficient as any stereotypes... sigh.)