If you are asking about the famous Jain tirth “Shri Mahaveerji” (Mahavirji), it is in the state of Rajasthan in India.

More exactly, it is in Karauli district, near Hindaun, on the bank of the Gambhir river in eastern Rajasthan. It is a very important Digambar Jain Atishay Kshetra of Bhagwan Mahavir.

You can read a bit more here