Bharat Kshetra (the central region of Jambudvipa) is divided from Airavat Kshetra by the Sita River (also called Sita Nadi). This is the principal river that marks the boundary between Bharat Kshetra and the neighboring region in Jain cosmology. You can read more here
Some Jain texts also speak of the great rivers like Ganga and Sindhu as important rivers of Bharat Kshetra, symbolizing its geographical and cultural heartland. However, the specific boundary river most often cited for Bharat Kshetra is the Sita Nadi.
Different Jain sects (Digambar and Shwetambar) share the core idea of the Sita River dividing Bharat Kshetra, and the basic cosmological layout remains consistent between them.
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