I got some help from at Discord, Reddit and ingame, and was able to compile this short list:
If i recall right, all the doors were visible in the game minimap, which helps a lot with finding the locations.
Mort
/waypoint 1934 1257 560 The three buildings just right next to the grid. Contains lvl 110-150 Medusas, cyborgs, onagi, rhinomen, bileswarm and NPCs.
/waypoint 1350 589 560 Ruins (Cyborg camp), 140ish hellhounds.
/waypoint 1351 562 560 Another building next door at is broken (Playshifting failed).
/waypoint 855 2278 560 (mini crater, daily mission location) 160ish Borgs. They drop the same daily mission body parts like the borgs outside.
/waypoint 1339 2753 560 North-West "mask of tragedy" crater, drills, aquaans lvl ~129-143.
/waypoint 1538 1095 560 Cyborg crater (south), snakes and stuff)lvl ~110-121.
Thanks Saavick, Lucier and wrecklord0 for helping to find these.
Tir County
/waypoint 2061 1124 646 Rollerrats < lvl 5.
/waypoint 2008 947 646 Mutants and animals < lvl 5.
/waypoint 2238 888 646 Leets & such lvl 1.
OA
All the inhabitants are around lvl 5 or lower.
/waypoint 576 290 540 NPCs & robots.
/waypoint 423 489 540 Seems to be the only location with named NPCs.
/waypoint 399 308 540 NPCs & mutants.
/waypoint 452 275 540 mutants.
/waypoint 524 246 540 NPCs & mutants.
/waypoint 497 356 540 NPCs & mutants.
Omni Trade
All the inhabitants are around lvl 5 or lower.
/waypoint 230 527 710 NPCs.
/waypoint 267 195 710 NPCs.
/waypoint 515 228 710 mutants & NPCs.
/waypoint 551 238 710 mutants.
/waypoint 551 271 710 mutants & NPCs.
/waypoint 519 467 710 NPCs.
/waypoint 579 521 710 NPCs.
Thanks to Shadex for help with finding these.
Stret east bank
I just stumbled into these ones almost accidentally. I don't recall anyone ever mentioning them, unlike the more well known examples around Mort and the cities. They are around the "mines" labels in Saavick's map, though.
/waypoint 1125 2125 635 60ish animals.
/waypoint 1140 1955 635 70ish mutants & nanofreaks.
/waypoint 1064 1080 635 50ish NPCs & scorpioids.
Omni forest
/waypoint 478 2160 716 shadowmutants lvl <5.
Thanks to Shadowmib.
Aegean
/waypoint 360 673 585 animals lvl 10-15
Thanks to OK-Manner1644.
Clondyke
/waypoint 1882 3805 670 Mutants 50ish
/waypoint 1954 3731 670 Mutants Aquaans 50ish
/waypoint 2014 3910 670 Rhinomen and animals 50ish
/waypoint 1994 3957 670 Mutants 50ish.
Thanks to Leileena.
Lush Fields
/waypoint 932 2837 695 Mutants, lvl 1!
/waypoint 2020 1956 695 Rhinomen lvl 10-15.
/waypoint 746 952 695 Mutants lvl 10ish.
/waypoint 1719 1005 695 Rhinomen and animals lvl 10-15.
/waypoint 3568 1565 695 Named NPCs and rollerrats lvl 10ish.
/waypoint 3439 2287 695 Mutants lvl 10ish.
/waypoint 3506 2953 695 Animals (Lost Pet Snakes and Minibrontos) lvl 10ish.
Thanks to Leileena.
Pleasant Meadows
/waypoint 2601 2085 630 Bileswarm, Aquaan, Medusa lvl 100ish.
/waypoint 2173 2327 630 Mutants lvl 30ish. Thanks to Leileena.
There are also seven more similar cave-like entrances located at river ends, foggy hill and Versailles moat. Unfortunately zoning didn't initiate whether trying in yalm or without, sideways, backwards to jumping. No error messages either, i guess they have been removed or gone broken at some point.
Most of the statics (though not all) are marked with red dots in the old CSPmap.
http://creativestudent.com/ao/#downloads