सप्तद्वीप-समुद्र-प्रमाणम्: प्लक्षादि-द्वीपवर्णनं, लोकालोक-सीमा, चन्द्र-समुद्र-वृद्धिक्षयः
ततस् तमः समावृत्य तं शैलं सर्वतः स्थितम् तमश् चाण्डकटाहेन समन्तात् परिवेष्टितम्
tatas tamaḥ samāvṛtya taṃ śailaṃ sarvataḥ sthitam tamaś cāṇḍakaṭāhena samantāt pariveṣṭitam
फिर तम (अंधकार) ने उस पर्वत को चारों ओर से ढक लिया; और वह अंधकार भी ब्रह्माण्ड के अण्ड-कटाह (जगत्-अण्ड के आवरण) से सर्वतः घिर गया।
Sage Parāśara (speaking to Maitreya)
Here tamas functions as the encircling darkness beyond the structured cosmic regions, indicating a boundary where ordered manifestation gives way to obscuration and unmanifest limitation.
Parāśara describes the world as surrounded by successive limits: a mountain at the edge of the known regions, then darkness covering it, and finally the brahmāṇḍa-like shell enclosing that darkness—presenting the cosmos as a contained, ordered system.
Even when the verse speaks of boundaries like darkness and the cosmic shell, the Purāṇic framework treats such order as dependent on Vishnu’s sovereign sustaining power, with the Supreme Reality underlying and regulating the manifested universe.