Ryloth

Ryloth, also known as Twi'lek, and Twi'lek Prime, was the harsh, rocky homeworld of the Twi'leks, an Outer Rim Territories world located on the Corellian Run and forming one endpoint of the Death Wind Corridor. One side of the planet perpetually faced its sun and the other remained in darkness, a phenomenon known as tidal locking. The dayside was referred to as the Bright Lands and the night-side was known as the Nightlands.