Okay. I used the search-function and couldn't find any topic about this. So...
It happened to me twice so far. Both times while i was doing gathering leves. And now i think: Zone-Borders should be more clear on the map! (Please...)
So this is what happened:
I activated a fishing leve today, R20, The Black Shroud, Camp Tranquil. So far so good. I used Guardian Favor for SP bonus. The fishing spot was very far away. At the east end of the map (at the lake right south of quarrymill).
The spot was at position 46, 50. And i saw the aetherial node longroot was kinda on the way. And also the lower way seemed to be a bit shorter then the upper way. Since i don't have the aetherial node for longroot, i thought to myself: Hey, why don't take the lower way and get the node at the way?
Of course i was thinking: Hmmm. There could be dangerous monsters ahead. Which would be way to strong for my R20 fisher. But that falls under the category "experience"... so i went ahead.
I was crossing the bridge at 41, 50 and BAM... "Only the Monke Onke" aborted." Then i remembered that crossing zones aborts leves. Okay, now, i forgot it, didn't pay attention and that was my own mistake. I wasn't very angry or anything. But then i remembered another time when that had happened to me.
I was doing a R40 Botanist leve at Halatali and got agro from one of those little "baby" scorpions. So i was running away. Haha! Who wouldn't? Since it would've killed me... so i was running and running, all over the wide open map and BAM, there it happened too. My leve was aborted...
The little creeper was following me all the way to the zone! Only after i crossed the border it returned to its territory. But by that time... it was already to late. I also think that might have been some kind of wrong programming. Since it was strange that it followed me THIS far. And SE already adjusted the system again, so this should not happen anymore. Still!
So this is why i would like to see more clear zone lines...
If i would've seen the border of the zone on my (mini-)map, then i would've probably turned around, trying to lose the melting by walking into the other direction.
Also, it's quit hard to remember where all the zones are. Especially on a map so open wide like Thanalan. You know it's somewhere between the camps and the nodes. And you can kinda "see it" if you walk over the map, cross the invisible zone border, and there are just no monsters around you, you're already wondering about that (maybe...), and then they suddenly appear all around you. Shock!
But if you're fleeing, or just looking for the shortest way, or traveling long ways (without a Chocobo under your back!), you don't always pay attention to those little things. Or maybe someone killed all the mobs in Thanalan, and that's why the area around you is totally empty. Muhahaha. (<= that's supposed to be funny!)
Well. I love the big maps, and the invisible zone lines. But it would be nice to see the borders at least on your (mini-)map.