'Enclosures' in the Bible

“And I will make your battlements of rubies,And your gates of [shining] beryl stones,And all your [barrier] walls of precious stones.

“Wail, O Heshbon, for Ai [in Ammon] has been destroyed!Cry out, O daughters of Rabbah!Wrap yourselves with sackcloth and lament (cry out in grief),And rush back and forth inside the enclosures;For Malcam [your powerless god] will go into exileTogether with his priests and his princes.