Valmiki Ramayana Sundara Kanda Sarga 36 Shloka 8
Original Shlokaशतयोजनविस्तीर्ण स्सागरो मकरालयः। विक्रमश्लाघनीयेन क्रमता गोष्पदीकृतः।।5.36.8।।
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विक्रमश्लाघनीयेन by your admirable prowess, क्रमता advancing, शतयोजनविस्तीर्णः extended over a hundred yojanas, मकरालयः abode of crocodiles, सागरः ocean, गोष्पदीकृतः is reduced to calf's hoof mark.
"You with your admirable prowess have reduced this ocean which is an abode of crocodiles stretching over a hundred yojanas to a cow's hoof mark.