Pollux

Pollux
Astrographical
Total stars	420 billion
Star systems	180 billion
Size	105,500 light years (longest axis)
Globular clusters	165
Societal
Regions	Galactic Core Inner Arm Central Ring Miradi Arm Mordox Space Galactic Rim Tenpax Companion Galaxy
Sentient species	30 million+

[Source]

Pollux is one of the two galaxies that make up The Twins.