Matsya Purana — Dhruva as Cosmic Pivot: Motions of Sun–Moon–Planets
गजानां पर्वतानां च मेघानां भोगिभिः सह कुलमेकं द्विधा भूतं योनिरेका जलं स्मृतम् //
gajānāṃ parvatānāṃ ca meghānāṃ bhogibhiḥ saha kulamekaṃ dvidhā bhūtaṃ yonirekā jalaṃ smṛtam //
Elephants, mountains, and clouds—together with serpentine beings—are said to belong to a single lineage that has become twofold; yet their one common source (yoni) is remembered to be water.
It asserts a water-based origin (yoni) shared by diverse forms—living (elephants, serpents) and non-living/atmospheric (mountains, clouds)—supporting the Purāṇic idea that, in dissolution and re-manifestation, forms resolve into and arise from elemental waters.
By emphasizing water as a fundamental source, it indirectly underlines a king’s and householder’s duty to protect water resources—rivers, tanks, rains, and irrigation—since prosperity of land, creatures, and climate is tied to water in Purāṇic thought.
While not giving a direct Vāstu rule, it reinforces a key Vāstu/ritual principle: water is foundational—thus site selection, temple/town planning, and rites often prioritize proximity to pure water, proper drainage, and honoring water as a sustaining element.