Hills of Norvos
The Hills of Norvos are crossed by swift, stony streams and honeycombed with caverns, which are sometimes inhabited by bears and wolves. A hundred leagues northwest of Norvos is a vast cave system considered a natural wonder by Lomas Longstrider and an entrance to the underworld according to legend.
After winning two victories over Norvoshi hosts in the hills, Qarlon the Great of Lorath decided to attack Great Norvos. The Valyrian Freehold came to the aid of Norvos, however, and defeated Qarlon with dragonfire.
A Game of Thrones