Velika Stena
Coastal–Karst, SI
Big wall of Osp, which was the first to interest climbers - back then with aid gear, ladders and such - is today the least interesting for climbing, as multi-pitch climbing is getting less popular. Since it represents a fairly independent part of crag, it is described seprately. But surely it would be good for you to check out a route or two and get a little taste of climbing history.