'Den' in the Bible

"Then a beast enters its lair and remains in its den.

Their eyes secretly watch the helpless, lying in wait like a lion in his den. They lie in wait to catch the afflicted. They catch the afflicted when they pull him into their net.

Like a lion, he has left his den. Indeed, their land has become a waste because of the anger of the oppressor and because of the LORD's fierce anger."

Will a lion roar in the forest without having found its prey? Will a young lion cry from its den without having caught anything?

Where is this lion's den? Where is the place where the young lions fed, where the lion and its mate walked with their young, the place where they feared nothing?