Valmiki Ramayana Ayodhya Kanda Sarga 49 Shloka 11

ततः then, सुचिरं कालम् for a long time, गत्वा having travelled, शीत जलाम् of cool waters, गोयुतानूपाम् cows abounding in marshy areas, सागरङ्गमाम् flowing into the sea, गोमतीम् Gomati, नदीम् river, अतरत् crossed.

Travelling for a long time along the river Gomati full of cool waters on whose marshy bank cows grazed, Rama crossed it at the point where it flows into the sea.