'Lions' in the Bible

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?

"I am against you," declares the LORD of the Heavenly Armies, "and I will send your chariots up in smoke. A sword will devour your young lions, I will eliminate your prey from the earth, and the voice of your messengers will no longer be heard."