Skandapurana 6.3.230.36

6.3.230.36

saṅgamaścāpi kubjāyāstīrthaṃ kubjeśvaraṃ tathā .
bilvāmrakaṃ tathā tīrthaṃ pūrṇadvīpamataḥ param .. 230.36 ..

and also the confluence of the Kubjā, and the sacred ford Kubjeśvara; / likewise the sacred ford Bilvāmraka, and after that Pūrṇadvīpa;