Devibhagavatapurana 9.13.7

9.13.7

śrīnārāyaṇa uvāca |
purā babhūva goloke sā gaṅgā dravarūpiṇī |
rādhākṛṣṇāṅgasambhūtā tadaṃśā tatsvarūpiṇī ||

Nârâyana said:-- O Muni! In ancient times, in the region of Goloka, Gangâ assumed the liquid appearance. She was born of the bodies of Râdhâ and Krisna. So She is of the nature of both of them and their parts. Gangâ is the presiding deity of water. She is unequalled in Her beauty in this world. She is full of youth and adorned with all ornaments.