. "boundary of Hong Kong and China" . . . "a restricted border region" . . . "Hong Kong-China barrier" . . . "Hong Kong\u2013China" . . . "Frontier Closed Area" . . "Closed Area Permit" . . . "Closed Area Permit police station" . . . "Closed Area" . "Frontier Closed Area" . "Closed Area Permits" . "Frontier_Closed_Area#Border_Road" . "Hong Kong\u2013China border" . "closure of borders" . . "Frontier_Closed_Area#Closed_Area_Permit" . . "border defence" . . "closes the border with Hong Kong" . . .