Diksha Nagri (diksha ki jagah) Bhagwan Vimalnath ki Kampilya (Kampil/ Kampilji) hai, jo aaj ki Uttar Pradesh ke Kampil shehar ke aas-paas sthit hai. Yahin par unhone Jambu vrksh ke neeche diksha li thi. Is jagah ko Digambar aur Shwetambar dono parampaaron me mukhya Diksha sthaan maana jata hai. You can read more here