Jisho

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Noun
1. red line
Noun
2. red-light district (marked by a red line on police maps)Historical term, Abbreviation, See also 赤線地帯
Noun
3. non-legal public road (denoted by a red line on cadastral maps; sometimes no longer physically existing)See also 法定外公共物
Wikipedia definition
4. Akasenis Japanese slang and a collective term which was used to identify districts in Japan where prostitution and the sex industry flourished until 1958. Akasen means literally "red-line". The districts were the designated regions for state-regulated prostitution. Hundreds of government-sanctioned brothels and other adult entertainment parlors were operating in these districts, with the most popular being Yoshiwara in the Akasen region in Tokyo.
Read “Akasen” on English Wikipedia
Read “赤線” on Japanese Wikipedia
Read “Akasen” on DBpedia

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