Valmiki Ramayana 7.4.24

ततः सा राक्षसी गर्भं घनगर्भसमप्रभम् ।प्रसूता मन्दरं गत्वा गङ्गा गर्भमिवाग्निजम्॥

tataḥ sā rākṣasī garbhaṃ ghanagarbhasamaprabham |prasūtā mandaraṃ gatvā gaṅgā garbhamivāgnijam ||

Our plain-language meaning of this verse is waiting for scholar review.