योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-25, verse-15

ततोऽपि द्विगुणं देहं दधत्या वलयाकृतिम् ।
जगद्भूतलताव्याप्तां शाकाख्यद्वीपलेखया ॥ १५ ॥

tato'pi dviguṇaṃ dehaṃ dadhatyā valayākṛtim ,
jagadbhūtalatāvyāptāṃ śākākhyadvīpalekhayā 15

15. tataḥ api dviguṇam deham dadhatyā valayākṛtim
jagadbhūtalatāvyāptām śākākhyadvīpalekhayā

15. tataḥ api dviguṇam deham valayākṛtim
jagadbhūtalatāvyāptām dadhatyā śākākhyadvīpalekhayā

15. Even greater than that, by the circular outline of the continent (dvīpa) named Śāka, which bears a body (form) twice the size, shaped like a ring, and covered with creeping plants spread across the earth (jagad).

Words meanings summery:

• ततः (tataḥ) - from that (the previous continent/entity) (from that, thence, even so)

• अपि (api) - even (emphasizing comparison to the previous entity) (also, even, too)

• द्विगुणम् (dviguṇam) - twice the size (of the previous continent/ocean) (twice, double, twofold)

• देहम् (deham) - a body or form (body, form, physical structure, essence)

• दधत्या (dadhatyā) - by that (the outline) which bears/assumes (by bearing, by holding, by possessing)

• वलयाकृतिम् (valayākṛtim) - a ring-shape (ring-shaped, circular in form, a circular form)

• जगद्भूतलताव्याप्ताम् (jagadbhūtalatāvyāptām) - a form/entity covered with creeping plants across the earth (covered with creeping plants on the earth's surface of the world)

• शाकाख्यद्वीपलेखया (śākākhyadvīpalekhayā) - by the circular outline of the continent named Śāka (by the outline/region of the continent named Śāka)

Words meanings and morphology

ततः (tataḥ) - from that (the previous continent/entity) (from that, thence, even so)

(indeclinable)

अपि (api) - even (emphasizing comparison to the previous entity) (also, even, too)

(indeclinable)

द्विगुणम् (dviguṇam) - twice the size (of the previous continent/ocean) (twice, double, twofold)

(adjective)

Accusative, neuter, singular of dviguṇa

dviguṇa - twice, double, twofold

Compound type : dvigu (dvi+guṇa)

• dvi – two
  numeral
• guṇa – quality, attribute, fold, multiple
  noun (masculine)

Note: Modifies 'deham'.

देहम् (deham) - a body or form (body, form, physical structure, essence)

(noun)

Accusative, neuter, singular of deha

deha - body, form, physical structure, essence

Note: Used here for the form or extension of the continent.

दधत्या (dadhatyā) - by that (the outline) which bears/assumes (by bearing, by holding, by possessing)

(verbal derivative)

Note: Active participle, acting as an adjective for the 'lekhā' (outline).

वलयाकृतिम् (valayākṛtim) - a ring-shape (ring-shaped, circular in form, a circular form)

(noun)

Accusative, feminine, singular of valayākṛti

valayākṛti - ring-shaped, circular in form, a circular form

Compound type : tatpuruṣa (valaya+ākṛti)

• valaya – ring, bracelet, circle
  noun (masculine)
• ākṛti – form, shape, figure, appearance
  noun (feminine)

Note: One of the objects borne by the outline.

जगद्भूतलताव्याप्ताम् (jagadbhūtalatāvyāptām) - a form/entity covered with creeping plants across the earth (covered with creeping plants on the earth's surface of the world)

(adjective)

Accusative, feminine, singular of jagadbhūtalatāvyāpta

jagadbhūtalatāvyāpta - covered with creepers on the land of the world

past passive participle used as adjective

Compound adjective formed from jagat + bhūtala + latā + vyāpta.

Compound type : tatpuruṣa (jagat+bhūta+latā+vyāpta)

• jagat – world, universe
  noun (neuter)
• bhūta – earth, land, being, element
  noun (neuter)
  Often means 'earth/land' when compounded, like in bhūtala (earth's surface).
• latā – creeper, vine
  noun (feminine)
• vyāpta – covered, pervaded, filled
  verbal derivative (masculine)
  past passive participle
  From root √āp (to obtain, reach) with prefix vi-.
  Prefix: vi
  Root: āp

Note: One of the objects borne by the outline, describing a feminine 'form' or 'shape'.

शाकाख्यद्वीपलेखया (śākākhyadvīpalekhayā) - by the circular outline of the continent named Śāka (by the outline/region of the continent named Śāka)

(noun)

Instrumental, feminine, singular of śākākhyadvīpalekhā

śākākhyadvīpalekhā - outline/region of the continent named Śāka

Compound noun.

Compound type : tatpuruṣa (śāka+ākhya+dvīpa+lekhā)

• śāka – Śāka (name of a tree, or the continent)
  proper noun (masculine)
• ākhya – named, called
  adjective (masculine)
  past passive participle
  From root ā-khyā (to name, tell).
  Prefix: ā
  Root: khyā
• dvīpa – island, continent, region
  noun (masculine)
• lekhā – line, outline, boundary, region, tract
  noun (feminine)

Note: The primary instrumental agent/means in the sentence.