Dark Waters (1994)

Dark Waters is a 1994 horror film about a young woman, who, after the death of her father, goes to a remote island convent where her mother died giving birth to her. There's a lot of atmosphere in this one.

Classic-Horror.com concludes with this:

It could easily be said that there is something in Dark Waters for everyone. However, in order to enjoy it, it really needs to be taken as a whole – the dizzying story embraced and experienced. If you’re willing to enter that kind of mindset, that kind of half-fantasy world, Dark Waters has the potential to be understood not only as a creepy religious horror, but as a fine addition to Lovecraftian filmmaking.

Empire Online describes it as "atmospheric, if plot-light".