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In the Mahabharata, Shri Krishna told Yudhishthira about his arrival in Dwaraka: "Leaving Mathura, we came to a city called Kushalasthali, adorned by the Raivata mountain. There, we built an impregnable fort, which was called Dwaravati or Dwaraka because of its many gates." ... In the Mahabharata Jana-Parva, Neelakantha has interpreted Kushavarta as Dwaraka.
In 'Braj ka Sanskritik Itihas', Prabhudayal Mittal has written that the Yadavas' arrival in the Shursena Janapada led to the great progress of the small kingdom of Dwaraka. There, an impenetrable fort and a vast city were built, and it was organized as a powerful Yadava kingdom of the Andhaka-Vrishni clan. That strong kingdom on the coast of India also became a vigilant sentinel of the country against the invasion of foreign non-Aryans. In the Gujarati language, 'Dwar' means port. Thus, Dwaraka or Dwaravati means the city of ports. From those ports, the Yadavas traveled to distant seas and earned vast wealth. In Dwaraka, there was no person who was poor, unfortunate, weak in body, or impure in mind.
(1) Rhys Davids has written that Kamboja was the capital of Dwaraka.
(2) In Petavaththu, Dwaraka is considered a city of Kamboja. Dr. Malashekhara, explaining this statement, has written that it is possible that this Kamboja is 'Kansabhoj', which was the country of the ten sons of Andhaka-Vrishni.
(2) Dr. Motichandra considers Kamboja to be the Pamir region and calls Dwaraka the city of 'Darvaaj', located north of the Vadarvansha.
"Kushalasthali Puri, beautiful, adorned by Raivata. There, we built a dwelling, O King! || 50 || ... And also a fort, impregnable even to the gods. Even women would fight there, what to speak of the Vrishni warriors! || 51 || ... Leaving Mathura, we went to Dwaravati Puri. || 67 ||"
-Mahabharata Sabhaparva, Chapter 14 (a) Mahabharata Janaparva, Chapter 160, Verse 50
(b) Atit ka Anavaran, Page 163. 3. Second Volume, Braj ka Itihas, Page 47. 4. Harivansha Purana 2.5.65.
Buddhist India, P. 28
Kamboja was the adjoining country in the extreme North-West, with Dvaraka as its Capital. 6. Petavaththu Part 2, Page 9. 7. The Dictionary of Pali Proper Names, Part 1, Page 1126. 8. Geographical and Economic Studies in the Mahabharata, Pages 32-40.