It is hoped that you have not forgotten that Svayambhuva Manu had a son named Priyavrata. Priyavrata had ten sons. Their  names were Agnidhra, Agnivahu, Vapushmana, Dyutimana, Medha, Medhatithi, Bhavya, Savana, Putra and Jyotishmana. Medha, Agnivahu and Putra had no desire to rule. They were not interested in material pursuits and became hermits. Priyavrata  divided the earth amongst the remaining seven sons. Thus it was that the earth came to be divided into seven regions or  dvipas. Agnidhra ruled over Jambudvip, Medhatithi over Plakshadvip, Vapushman over Shalmalidvip, Jyotishman over  Kushadvip, Dyutimana over Krounchadvip, Bhavya over Shakadvip & Savan over Pushkaradvip. Agnidhra, the ruler of  Jambudvipa, had nine sons. Their names were Nabhi Kimpurusha, Hari, Ilavrita, Ramya, Hiranyavana, Kuru, Bhadrashva and  Ketumala.  

Agnidhra divided Jambudvipa into nine regions (varshas) and gave each of his sons a region to rule over. A king named Bharata  was one of Nabhi’s descendants. After the name of Bharata, the region that Nabhi ruled over has come to be known as  Bharatavarsha. There are 14 regions (lokas) in the universe. 7 of them form upper regions. Their names are bhuloka, bhuvarloka, svarloka, maharloka, janaloka, tapolaka & satyaloka. Bhuloka is the earth and its limits extend upto the points that  can illuminate the rays of the sun & the moon. 

Take the distance from bhuloka to the solar circle. An equal distance beyond the solar circle constitutes bhuvarloka. The region  from the limits of bhuvarloka to the region of Dhruva (the Pole Star) is svarloka or svarga (heaven). 

Above the solar circle is the lunar circle and above that come, successively, the regions of the stars (nakshatras), Budha  (Mercury), Shukra (Venus), Mangala (Mars), Brihaspati (Jupiter), the saptarshis’ (the constellation Ursa Majoris or the Great  Bear) and Dhruva. 

Shani (Saturn), Brihaspati and Mangala move slowly. The sun, the moon, Budha and Shukra move relatively fast.  The sun’s chariot is drawn by 7 horses named

Gayatri, Vrihati, Ushnika, Jagati, Pamki, Anushtupa and Trishtupa.  

In each month, the sun adopts a specific form known as an aditya. 

There are thus 12 Adityas –

Dhatta, Aryama, Mitra, Varuna, Shakru, Vivasvana, Pusha, Parjanya, Amshu, Bhaga, Tvashta, and Vishnu. 

Maharloka is above the world of Dhruva (dhruvaloka). It is reserved for those who have been freed from the bonds of the  world. Janaloka is still further away. Brahma’s sons live there. Tapaloka is beyond janaloka and satyaloka is beyond tapaloka.  Another word for satyaloka is brahmaloka, since Brahma lives there. Vishnu lives there as well. The Kurma Purana does not  mention the 7 lokas that constitute the lower regions of the universe. This is the underworld (patala loka) 

There are 7 seas that surround the 7 dvipas on Earth. The names of the seas are Kshara, Ikshu, Sura, Ghrita, Dadhi, Kshira and Svadu.  

The names of the seven oceans often differ from Purana to Purana. 

Right in the centre of Jambudvipa is Mount Sumeru. To its south lie the mountains Himavana, Hemakuta and Nishadha; and to  its north the mountains Nila, Shveta and Shringi. Bharatavarsha is to the south of Mount Sumeru. Brahma’s assembly is located on the peak of Mount Sumeru.