売ばい春しゅん街がい

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Meanings

1

noun

Refers to an area where prostitution is concentrated; a straightforward compound of 売春 (prostitution) and 街 (district).

sell

春springtime, spring (season)

街boulevard, street, town

風ふう俗ぞく街がい
風俗街 is a broader term for an entertainment district with adult services, while 売春街 specifically emphasizes prostitution.
赤あか線せん
赤線 is a historical term for designated red-light districts in post-war Japan, now largely obsolete.

Compound of 売春 (prostitution) and 街 (district, street).