Valmiki Ramayana Bala Kanda Sarga 32 Shloka 10

राम Rama, सा एषा मागधी the same Magadhi river, महात्मन: of the magnanimous, तस्य वसो: pertains to Vasu, पूर्वाभिचरिता flowing from east, सुक्षेत्रा with fertile fields, सस्यमालिनी surrounded by crops as a garland.

Rama, this Magadhi river, of great Vasu flows from the east surrounded by fertile crops fields like a garland.