In C/Program Files/Baldur's Gate II/override there are 4 rather cryptic bitmaps. They are called ar0072ht, ar0072lm, ar0072sr and ar0205sr. I recognise ar0205sr as a fairly crude map of the (spoiler) beholder tunnels under the temple district. Does anyone recognise any of the others?

I forgot to mention I have a full install of BG2 on my computer. They may not be there on minimum or recomended installations.

These are the various trigger maps etc for the various areas. there are only two areas mentioned here - the beholder one (which you re correct about), and the other one which comes in various versions and seem to be Illithid in nature. Ill load IEE and check out that number, that will be easiest I feel.

Ah, well I was close. Its the Temple of Llolth in Ust Natha.