योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-59, verse-35

रुद्रोपेन्द्रमहेन्द्राद्या शैलसागरसंकुला ।
पातालरोदोदिक्स्वर्गमार्गसंकटकोटरा ॥ ३५ ॥

rudropendramahendrādyā śailasāgarasaṃkulā ,
pātālarododiksvargamārgasaṃkaṭakoṭarā 35

35. rudropendramahendrādyāḥ śailasāgarasaṅkulā
pātālarododiksvaragamārgasaṅkaṭakoṭarā

35. rudropendramahendrādyāḥ śailasāgarasaṅkulā
pātālarododiksvaragamārgasaṅkaṭakoṭarā

35. [This creation is] headed by Rudra, Upendra, and Mahendra; filled with mountains and oceans; and possessing narrow, cavernous paths leading to the netherworlds, the two realms of earth and sky, the cardinal directions, and the heavens.

Words meanings summery:

• रुद्रोपेन्द्रमहेन्द्राद्याः (rudropendramahendrādyāḥ) - with prominent deities like Rudra, Upendra (Vishnu), and Mahendra (Indra) (beginning with Rudra, Upendra, and Mahendra)

• शैलसागरसङ्कुला (śailasāgarasaṅkulā) - teeming with various geographical features (filled with mountains and oceans)

• पातालरोदोदिक्स्वरगमार्गसङ्कटकोटरा (pātālarododiksvaragamārgasaṅkaṭakoṭarā) - characterized by intricate, cavernous routes connecting all realms of existence (having narrow cavities as paths to the netherworlds, the two shores (heaven and earth), directions, and heaven)

Words meanings and morphology

रुद्रोपेन्द्रमहेन्द्राद्याः (rudropendramahendrādyāḥ) - with prominent deities like Rudra, Upendra (Vishnu), and Mahendra (Indra) (beginning with Rudra, Upendra, and Mahendra)

(adjective)

Nominative, feminine, singular of rudropendramahendrādyā

rudropendramahendrādyā - starting with Rudra, Upendra, Mahendra

Compound type : bahuvrihi (rudra+upendra+mahendra+ādi)

• rudra – Rudra (a Vedic deity, later Shiva)
  proper noun (masculine)
• upendra – Upendra (an epithet of Vishnu, younger brother of Indra)
  proper noun (masculine)
  Prefix: upa
• mahendra – Mahendra (an epithet of Indra, great Indra)
  proper noun (masculine)
• ādi – beginning, source, etc.
  noun (masculine)

Note: Qualifies `sṛṣṭiḥ` (from previous verse).

शैलसागरसङ्कुला (śailasāgarasaṅkulā) - teeming with various geographical features (filled with mountains and oceans)

(adjective)

Nominative, feminine, singular of śailasāgarasaṅkula

śailasāgarasaṅkula - filled with mountains and oceans

Compound type : tatpurusha (śaila+sāgara+saṅkula)

• śaila – mountain, rock
  noun (masculine)
• sāgara – ocean, sea
  noun (masculine)
• saṅkula – filled, crowded, full of
  adjective (masculine)
  Derived from `sam-kul` (to collect, crowd).
  Prefix: sam
  Root: kul (class 1)

Note: Qualifies `sṛṣṭiḥ`.

पातालरोदोदिक्स्वरगमार्गसङ्कटकोटरा (pātālarododiksvaragamārgasaṅkaṭakoṭarā) - characterized by intricate, cavernous routes connecting all realms of existence (having narrow cavities as paths to the netherworlds, the two shores (heaven and earth), directions, and heaven)

(adjective)

Nominative, feminine, singular of pātālarododiksvaragamārgasaṅkaṭakoṭara

pātālarododiksvaragamārgasaṅkaṭakoṭara - having narrow cavities as paths to Pātāla, Rodas, Diks, and Svarga

Compound type : bahuvrihi (pātāla+rodas+dik+svarga+mārga+saṅkaṭa+koṭara)

• pātāla – netherworld, underworld
  noun (neuter)
• rodas – heaven and earth (dual)
  noun (neuter)
• dik – direction, quarter of the sky
  noun (feminine)
• svarga – heaven, paradise
  noun (masculine)
• mārga – path, road, way
  noun (masculine)
  Action Noun
  Derived from `mṛj` (to go, move).
  Root: mṛj (class 2)
• saṅkaṭa – narrow, difficult, dangerous, crisis
  adjective (neuter)
  Prefix: sam
• koṭara – cavity, hollow, socket (of a tree), hole
  noun (neuter)

Note: Qualifies `sṛṣṭiḥ`.