Invocations, Definition and Authority of Purāṇa, Pulastya–Bhīṣma Frame, and the Creation–Dissolution Schema
तदीयानि च वर्षाणि नदीभिः पर्वतैः सह । जंबूद्वीपादयो द्वीपाः समुद्रैः सप्तभिर्वृताः
tadīyāni ca varṣāṇi nadībhiḥ parvataiḥ saha | jaṃbūdvīpādayo dvīpāḥ samudraiḥ saptabhirvṛtāḥ
அதன் வர்ஷங்கள் நதிகளும் மலைகளும் உடன் கூறப்பட்டன; ஜம்பூத்வீபம் முதலான தீவுகள் ஏழு கடல்களால் சூழப்பட்டுள்ளன.
Not explicitly stated in the provided excerpt (context-dependent narration)
Primary Rasa: adbhuta
Secondary Rasa: shanta
Type: celestial_realm
Sandhi Resolution Notes: सप्तभिर्वृताः = सप्तभिः + वृताः.
It summarizes Purāṇic world-structure: regions (varṣas) characterized by rivers and mountains, and the dvīpas (starting with Jambūdvīpa) arranged as being encircled by seven oceans.
They are a standard cosmographic motif describing seven concentric seas surrounding the dvīpas; different Purāṇas elaborate their names and symbolic substances, but the key point here is the layered, ordered structure of the world.
This specific verse is primarily descriptive (cosmography). Its broader lesson is contextual: it frames sacred history and dharma within an ordered cosmos, which later sections connect to pilgrimage, devotion, and right conduct.