Originally posted by The Masquerade:

so far ive only managed to find 2 dungeons in the four mountain bioms ive been in. havent come across any particularly large sections of mountains yet but compared to the loads of sunken crypts ive found in the few swamps ive been in. they also blend in as opposed to the bright green torches outside of crypts. im on my first playthrough and just killed moder. currently trying to get a set of the fenris armor crafted for that movement speed buff.