Interesting, I wonder how high they go?

The narrator wondered about that, too.

Yeah.

The skibidi toilet realm... so close but so far...

...wat.

An awesome piece of worldbuilding. I guess the smaller, "rooted" hills indicate that they indeed grow up from the ground and not, for example, grow down from some mysterious structure above. Given, that the rocks kinda pull the plants up and let them grow across them, I'd assume that there is no structure at the top, only floating rocks entangled by the plants. Then again, they might bloom above the mist blanket or connect with each other in some sort of weird, exotic weblike pattern like neurons, or something else, all speculation and unknown to the narrator who found themself unable to figure it out. I guess the only hint might be passing shadows from the daylight sun, but if the mist just ends up in a thick, permanent cloud layer, there would be no precise shadow on the ground which might reveal what's beyond the clouds.

A neat little story, the mystery is quite tangible and with the mist coverage being permanent and the narrator not being able to reach the top, the mystery just deepens. I adore this kind of worldbuilding. Keep it coming! :)

Those are some lovely interpretations of the landscape's possible top, I do like the upper web version quite a lot - reminds me of the spider silk "orbital station" from Children of Time.

Another fine addition to the bizarre wolds collection!

They could try installing a sap spigot into the vines. There are some jungle vines that have water flowing through them, so I don't see how they can't derive moisture from from the vines themselves.

Some jungle vines do that, others are the base for curare. These vines were unsuitable to be used as fluid source.