G flat major

G♭ major

Relative key	E♭ minor enharmonic: D♯ minor
Parallel key	G♭ minor enharmonic: F♯ minor
Dominant key	D♭ major enharmonic: C♯ major
Subdominant	C♭ major enharmonic: B major
Enharmonic	F♯ major
Component pitches
G♭, A♭, B♭, C♭, D♭, E♭, F, G♭

G-flat major is a major scale based on G-flat, consisting of the pitches G♭, A♭, B♭, C♭, D♭, E♭, and F. Its key signature has six flats.

Its relative minor is E♭ minor (or enharmonically D♯ minor) and its parallel minor is G♭ minor, usually replaced by F♯ minor, since G♭ minor's two double-flats make it generally impractical to use.

The direct enharmonic equivalent of G♭ major is F♯ major, a key signature with six sharps.

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Wikipedia