The seven oceans respectively contain salt water, sugarcane juice, liquor, clarified butter, milk, emulsified yogurt, and sweet drinking water. All the islands are completely surrounded by these oceans, and each ocean is equal in breadth to the island it surrounds. Mahārāja Priyavrata, the husband of Queen Barhiṣmatī, gave sovereignty over these islands to his respective sons, namely Āgnīdhra, Idhmajihva, Yajñabāhu, Hiraṇyaretā, Ghṛtapṛṣṭha, Medhātithi and Vītihotra. Thus they all became kings by the order of their father.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
क्षारोदेक्षुरसोदसुरोदघृतोदक्षीरोददधिमण्डोदशुद्धोदाः सप्तजलधयः सप्तद्वीपपरिखा इवाभ्यन्तरद्वीपसमाना एकैकश्येन यथानुपूर्वं सप्तस्वपि बहिर्द्वीपेषु पृथक्परित उपकल्पितास्तेषु जम्ब्वादिषु बर्हिष्मतीपतिरनुव्रता- नात्मजानाग्नीध्रेध्मजिह्वयज्ञबाहुहिरण्यरेतोघृतपृष्ठ- मेधातिथिवीतिहोत्रसंज्ञान् यथासङ्ख्येनैकैकस्मि- न्नेकमेवाधिपतिं विदधे
kṣārodekṣurasodasurodaghṛtodakṣīrodadadhimaṇḍodaśuddhodāḥ saptajaladhayaḥ saptadvīpaparikhā ivābhyantaradvīpasamānā ekaikaśyena yathānupūrvaṃ saptasvapi bahirdvīpeṣu pṛthakparita upakalpitāsteṣu jambvādiṣu barhiṣmatīpatiranuvratā- nātmajānāgnīdhredhmajihvayajñabāhuhiraṇyaretoghṛtapṛṣṭha- medhātithivītihotrasaṃjñān yathāsaṅkhyenaikaikasmi- nnekamevādhipatiṃ vidadhe
SB 5.1.33