Varāha-uddhāraṇa and the Re-constitution of Bhū-maṇḍala
Earth after Pralaya
चतुर्णामथ दुर्गाणां स्वयमुत्थानि त्रीणि च / चतुर्थ कृतिमं दुग तस्य वक्ष्यामि निर्णयम्
caturṇāmatha durgāṇāṃ svayamutthāni trīṇi ca / caturtha kṛtimaṃ duga tasya vakṣyāmi nirṇayam
There are four kinds of fortresses (durga); three arise of themselves, being natural. The fourth is an artificial fortress—its definition I shall declare.