Valmiki Ramayana Aranya Kanda Sarga 69 Shloka 26

तं शब्दम् that sound, काङ्क्षमाणः a man looking for it, सहानुजः along with his brother, रामः Rama, कक्षे on the side, सुमहाकायम् one with a huge body, विपुलोदरम् and a big belly, राक्षसम् demon, ददर्श saw.

While looking for the sound, Rama with his brother saw a demon with a huge body and a big belly.