Pṛthivy-Āyāma-Vistara (Extent of the Earth) and Jambūdvīpa–Navavarṣa Description
कालाम्रस्य रसं पीत्वा सर्वे च स्थिरयौवनाः / दक्षिणेन तु श्वेतस्य नीलस्यैवोत्तरेण च
kālāmrasya rasaṃ pītvā sarve ca sthirayauvanāḥ / dakṣiṇena tu śvetasya nīlasyaivottareṇa ca
By drinking the juice of the dark mango (kālāmra), all remain steadfast in youth—south of Mount Śveta and north of Mount Nīla.