Srimad-Bhagavatam: Canto 5 - Chapter 1 - Verse 5
Sanskrit:
तत्र चतुर्धा भिद्यमाना चतुर्भिर्नामभिश्चतुर्दिशमभिस्पन्दन्ती नदनदीपतिमेवाभिनिविशति सीतालकनन्दा चक्षुर्भद्रेति ॥ ५ ॥
ITRANS:
tatra caturdhā bhidyamānā caturbhir nāmabhiś catur-diśam abhispandantī nada-nadī-patim evābhiniviśati sītālakanandā cakṣur bhadreti.
Translation:
On top of Mount Meru, the Ganges divides into four branches, each of which gushes in a different direction [east, west, north and south]. These branches, known by the names Sītā, Alakanandā, Cakṣu and Bhadrā, flow down to the ocean.