Bhū-maṇḍala

Bhū-maṇḍala is the Earth planetary system, consisting of 7 islands (dvīpas) and 7 oceans, which were created by the chariot wheels of Mahārāja Priyavrata.

Size
93,000,000 miles approximately. The radius of Bhū-maṇḍala extends as far as the sun spreads its light and heat and as far as the moon and all the stars can be seen.

Gāyatrī-mantra
om bhūr bhuvaḥ svaḥ... The word bhūr in the Gāyatrī-mantra refers to Bhū-maṇḍala.