The Manifestation of Katyayani (Durga) and the Humbling of the Vindhya by Agastya
ततः स्तुताः देववरैर्मृगेन्द्रमारुह्य देवी प्रगतावनीध्रम् विन्ध्यं महापर्वतमुच्चशृङ्गं चकार यं निम्नतरं त्वगस्त्यः
tataḥ stutāḥ devavarairmṛgendramāruhya devī pragatāvanīdhram vindhyaṃ mahāparvatamuccaśṛṅgaṃ cakāra yaṃ nimnataraṃ tvagastyaḥ
Then, praised by the foremost of the gods, the Goddess mounted the lord of beasts (the lion) and set forth upon the earth that bears the mountains. She went to Vindhya, the great mountain with lofty peaks—Vindhya which Agastya had made lower.
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Cosmic order is maintained through cooperation between divine power (Devī) and ascetic authority (Agastya); the myth teaches restraint of excess (Vindhya’s overgrowth) and the necessity of humility before dharma-supporting sages.
This is best classed under 'manvantara/vaṃśānucarita' in the loose Purāṇic sense of narrating exemplary figures (ṛṣis) and sacred-world ordering events; it also serves as a tīrtha/geography-adjacent etiological notice (though not a full māhātmya passage by itself).
Vindhya symbolizes unchecked expansion or pride; Agastya’s making it 'lower' represents the leveling power of tapas and wisdom. Devī’s lion mount signifies sovereign śakti moving to a liminal frontier (Vindhya) where order and wildness meet.