User blog comment:Lord Loss/Discussion of the Week: Unique Areas/@comment-50.140.122.135-20120911092218/@comment-1011548-20120911143647

Deserted Island is a general habitat, Mountain Summit is on the list, and the White Fatalis is fought in just one area of the Tower, which isn't very unique and will come up in some DotW in the future looking at the man-made environments (Town, Fortress, Tower, Interceptor's Base).

You could just about argue Tower 3 should be on this list - it's an area only ever used for one 'final boss monster', Yama - but frankly I don't care.