Arthashastra
शौर्यं स्थैर्यं दाक्ष्यं बाहुल्यं च जानपदेषु ॥
In countries inhabited by people, there are mountains and islands (as natural forts); in the absence of an expansive country, forts are resorted to.
english translation
zauryaM sthairyaM dAkSyaM bAhulyaM ca jAnapadeSu ॥
hk transliteration by Sanscript