Matsya Purana — Division of Bhārata-varṣa
रामठाः कण्टकाराश्च कैकेया दशनामकाः क्षत्रियोपनिवेश्याश्च वैश्याः शूद्रकुलानि च //
rāmaṭhāḥ kaṇṭakārāśca kaikeyā daśanāmakāḥ kṣatriyopaniveśyāśca vaiśyāḥ śūdrakulāni ca //
The Rāmaṭhas and the Kaṇṭakāras; the Kaikeyas and those known as the Daśanāmaka; likewise the settlements of Kṣatriyas, as well as the Vaiśyas and the clans of Śūdras.
This verse does not discuss Pralaya; it functions as an ethnographic/genealogical register, naming peoples and social group settlements recognized in the Purana’s world-map tradition.
Indirectly, it frames society as composed of distinct peoples and varṇa-based communities (Kṣatriya, Vaiśya, Śūdra), implying the king’s duty to govern and protect diverse settlements and lineages according to dharma.
No direct Vāstu or ritual rule appears here; however, the term upaniveśa (“settlement/colony”) is relevant to how the Purana conceptualizes organized habitation and community distribution.