start at the edge of them map, fully rested.
Exactly as you do in BG3 ...
Even tho it is a little weird ... im not sure how long was our Tav falling.
But i doubt s/he managed to long rest meanwhile.
You travel about, fight some stinking dang tough spiders. Still can't long rest unless you leave the entire Lava Forest and go somewhere else. You wander about. Dang! Fire elemental and minions. Freaking tough fight. Very challenging. Still can't rest. Another fight. Even more challenging because all you've been able to do is short rest because you still haven't found the long rest camp.
This can never work in BG 3 ...
All you need to do is travel back few seconds until you would no longer be in danger zone. MAAAAAYBE you would be able to have such experience from the beach to the Grove ... but beyond that?
That is the problem of "big map" we get ...
Larian would need to tear their map to separate parts and restrict our movement somehow (or include consequences in form of timed events).
I would bet this is the reason we can rest wherever and whenever we want to ...
