noun
Yamaguchi (city, prefecture)
Refers to Yamaguchi City or Yamaguchi Prefecture in Japan.
山口県は本州の西端にあります。
Yamaguchi Prefecture is at the western end of Honshu.
The name is a compound of 山 (yama, 'mountain') and 口 (kuchi, 'mouth/entrance'), likely referring to a geographical feature.