Srimad-Bhagavatam: Canto 5 - Chapter 1 - Verse 36
Sanskrit:
लोकालोक इति समाख्या यदनेनाचलेन लोकालोकस्यान्तर्वर्तिनावस्थाप्यते ॥ ३६ ॥
ITRANS:
lokāloka iti samākhyā yad anenācalena lokālokasyāntarvar-tināvasthāpyate.
Translation:
Between the lands inhabited by living entities and those that are uninhabited stands the great mountain which separates the two and which is therefore celebrated as Lokāloka.