Sailable | a. Capable of being sailed over; navigable; |
金城湯池 | [きんじょうとうち, kinjoutouchi] (n) an impregnable fortress; an unassailable territory [Add to Longdo] |
要害堅固 | [ようがいけんご, yougaikengo] (n, adj-no) (a fortress being) impregnable; unassailable [Add to Longdo] |