岡山県[okayamaken] Okayama prefecture (Chuugoku area)
岡持ち[okamochi] wooden carrying box
岡焼き[okayaki] jealousy
岡場所[okabasho] red-light district
岡目[okame] looking on from the side

静岡県[shizuokaken] Shizuoka prefecture (Chuubu area)
福岡県[fukuokaken] Fukuoka prefecture (Kyushu)
岡辺[okabe] vicinity of a hill
岡惚れ[okabore] unrequited love