(Internet slang, especially anime and manga fandom) events or things from the past which one wants to whitewash/erase from history (due to it being embarrassing, poorly received, etc.); dark past

study of history

historic, historical / already-happened, past / former, old, traditional

state of emergency (governmental decree)

Shūnan

"island of the south" (a generic fantasy tropical paradise present in Japanese culture)

Kyūjitai form of 南国

South Australia (a state of Australia)

Dated spelling of 南ア (Nan'a, “South Africa (a country)”).

Nanzhao