Lake

https://www.google.com/search?q=radhakrishna+lake

Vajranatha

Vajranabha built a bathing tank at Syama Kunda to commemorate the place where Krishna killed Aristasura. When there is water in Syama Kunda this kunda cannot be seen. When Syama Kunda is empty, you can see a wall encircling a small deep kunda in the center of Syama Kunda. This kunda is called Vajranatha Kunda.

https://www.google.com/search?q=Vajranatha+Kunda

Jal Mahal

https://www.google.co.in/search?q=Barsana+Jal+Mahal

Nagaridas

http://jagadanandadas.blogspot.com/2009/03/nagari-das.html
The rasik saint Nagaridas ji resided here whilst he composed paeans about the lilas of Shyama Shyam
https://b21a.blogspot.com/search/label/Gahvar

Kund

https://www.google.co.in/search?q=vrishbhanu+kirti+kund

Pushti

http://pushtimarg.net/pilgrimage/barsana/

Situated here is a sitting-place (baithaka) of Vallabhacharya, where he recited Shrimad Bhagavata
https://b21a.blogspot.com/search/label/Gahvar

Gahvar

http://www.brajfoundation.org/projects.php?brajfoundation=53
https://en.brajdiscovery.org/index.php?title=Gahvaravan

Map
http://wikimapia.org/21327327/Gahvar-Kund-Krishna-Kund
https://placesmap.net/IN/Gahvar-Kund-133139/

Tube
https://www.youtube.com/results?search_query=Gahvar+Kund

Slides
https://www.slideshare.net/search/slideshow?searchfrom=header&q=Gahvar+Kund

Note
It is shaped like a conch