Capital of the adult Krishna, where he lived with his wives.
Read about Dwaraka here
https://www.holydham.com/dwarka
After Dwaraka was destroyed Krishna left the world.
Read about a meeting with Durvasa before he left – ‚Durvasa and Krishna‘
http://sushmajee.com/biographies/bio-D/durvaasaa-3.htm
Read about his leaving the world
http://hindumythologyforgennext.blogspot.com/2012/12/krishna-and-jara-curse-of-gandhari-part.html
Read the legend of Dwaraka
https://www.mahabharataonline.com/articles/mahabharata_article.php?id=32