Matsya Purana — Description of Gomedaka and Puṣkara Dvīpas; the Lokāloka Boundary; Ocean Tide...
पृथ्व्यादयस्तु वाय्वन्ताः परिच्छिन्नास्तु तत्र ते भूतेभ्यः परतस् तेभ्यो ह्य् अलोकः सर्वतः स्मृतः //
pṛthvyādayastu vāyvantāḥ paricchinnāstu tatra te bhūtebhyaḥ paratas tebhyo hy alokaḥ sarvataḥ smṛtaḥ //
Earth and the other elements, up to and including wind, are held to be bounded there. Beyond those elements, on every side, lies what is remembered as ‘Aloka’—the lightless region.
It frames the gross elements (earth through wind) as finite and bounded, implying that during Pralaya the manifest, element-based cosmos gives way to a beyond—the ‘Aloka’—outside ordinary elemental space.
Indirectly, it supports the Matsya Purana’s ethical stance that worldly power and possessions are limited (paricchinna); kings and householders should rule and live with restraint, remembering the bounded nature of the elemental world.
No direct Vastu or ritual rule is stated, but the cosmological idea of bounded realms informs Purāṇic temple symbolism—temples model the ordered, delimited cosmos, oriented against the darkness ‘beyond’ (aloka) through sanctified light and directionality.