Matsya Purana — Cosmography of Jambūdvīpa: Varṣas
तस्मिन्वर्षे महावृक्षो लकुचः पत्त्रसंश्रयः तस्य पीत्वा फलरसं तत्र जीवन्ति मानवाः //
tasminvarṣe mahāvṛkṣo lakucaḥ pattrasaṃśrayaḥ tasya pītvā phalarasaṃ tatra jīvanti mānavāḥ //
In that Varṣa stands a great tree called Lakuca, whose broad leaves serve as shelter; by drinking the juice of its fruits, the people there sustain their lives.
It does not describe Pralaya directly; it presents a cosmographic detail—how beings in a particular Varṣa are sustained through a life-supporting sacred tree and its fruit-juice.
Indirectly, it supports the Purāṇic ideal that rulers and householders should protect life-sustaining natural resources—trees, groves, and water—since prosperity and longevity are tied to ecological guardianship.
No explicit Vāstu or ritual rule is stated; however, the image of ‘leaf-shelter’ aligns with the broader Indian tradition of sacred groves and shaded rest-spaces, often preserved near tīrthas and settlements.