A cave entrance? For Unfinished Business mod?

Has someone noticed this before in the south area between Beregost and Nashkel (it's a cave entrance)?
Cut from the original game?
I'm sure there should be a travel trigger and a simple cave area.
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What do you think?

P.S.:
I wish that someone could continue the UB mod work.
It would be really great to see such stuff like:
Ajantis and the monks quest
Nim Furlwing and the hunting dogs quest
Llindellyn and the lucky arrow quest
Welt and Pooch and the rats quest

or even the dreamsequence...