Jamieson, Fausset and Brown on Nahum 2:11

11. dwelling of ... lions--Nineveh, the seat of empire of the rapacious and destructive warriors of various ranks, typified by the "lions," "young lions," "old lion" (or lioness [Maurer]), "the lion's whelp." The image is peculiarly appropriate, as lions of every form, winged, and sometimes with the head of a man, are frequent in the Assyrian sepulchres. It was as full of spoils of all nations as a lion's den is of remains of its prey. The question, "Where," &c., implies that Jehovah "would make an utter end of the place," so that its very site could not be found (Na 1:8). It is a question expressing wonder, so incredible did it then seem.