"South of Baldur's Gate" is the entire map! :confused:
Anyway, there are certain areas that are prone to crashing (Beregost is one). There is a fix available
for that particular annoyance, but there are other fixes and patches
However, your best bet is to install something like EasyTuTu or BGT, which incorporates most of the fixes available, and allows you to play BG1 in the superior BG2 engine.