Shri Simandhar Swami is believed to be in Mahavideh Kshetra, in the Videha region of the Jain cosmology.

He is considered to be presently vihāra-free and giving dharma updesh there, because in Mahavideh Kshetra Tirthankars are currently existing.

In simple words: He is in Mahavideh Kshetra, not in Bharat Kshetra.