noun
south side of a mountain; Sanyo district
The literal meaning is 'south side of a mountain', but in modern usage it almost always refers to the Sanyo region of Japan (southern Honshu along the Seto Inland Sea). The literal sense is rare outside of classical or poetic contexts.
山陽地方は瀬戸内海に面している。
The Sanyo region faces the Seto Inland Sea.
山陽新幹線で
I went to Hiroshima on the Sanyo Shinkansen.