Frontier Caverns

The Frontier Caverns is a location in Dragon's Dogma.

Location
To reach it ,one must head to the Shadow Fort. One can reach the shadow fort by waiting until they receive the main quest for it, or by going through the quarry and then heading north. If the quest is done, then there won't be any enemies in the fort. Otherwise, it will be full of Goblins and three cyclops.

Near the end of the fort there is a Goblin dug cave that you can fit in, follow it to the Caverns.

Details
The cavern is full of Goblins and Hobgoblins, and theres quite a bit of gold too. Eventually the Caverns will end into the Proving Arena, it's usually closed. Unless a quest is activated, or you've reached postgame.