What are best base locations under the map ? [Request]

[Montana]

Not looking for mineshafts, im talking like actually under the map on or near water level.

Bonus points if its very flat since PAL ai on servers is garbage

[Shrub]

The problem with under the map is it's just void.

Your ideal spot is behind the red wall in front of the tree - flat grassland bliss.

Abiding by your 'under the map' request, I saw a reddit clip near release where someone got under the inlet north of Grassy Behemoth Hills by unmounting their lucky Eikthyrdeer at the correct time.

I tried once, but I wasn't really interested so I gave up lol. I wish you better success.