Skandapurana 16.35.47

16.35.47

dhāreśvarātpunaścānyadgaṃgodbhedamiti smṛtam ..
sārasvataṃ tathā gāṃgaṃ yatraikaṃ saṃsthitaṃ jalam ..
tasmādanyatparaṃ tīrthaṃ puṃḍarīkaṃ tataḥ param .. .. 47 ..

Beyond Dhāreśvara is another remembered as Gaṅgodbheda, / where the water of Sarasvatī and that of the Gaṅgā unite as one. / Beyond that is another supreme sacred ford, Puṇḍarīka; then beyond that