汉代称山，南北朝称难留山，延及唐初，山县名不复存在，以长阳县名取而代之。
B-Time I-Time B-Location I-Location O B-Time I-Time I-Time O B-Location I-Location I-Location O O O B-Time I-Time O B-Location I-Location O O O O O O O B-Location I-Location I-Location O O O O O O