Valmiki Ramayana Yuddha Kanda Sarga 22 Shloka 71
Original Shlokaसवानरवरश्रशीमान्विश्वकर्मात्माजोबली । बबन्धसागरेसेतुंयथाचाप्यतथापिता ।।6.22.71।।
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वानरवरः foremost of the Vanaras, श्रीमान् glorious, विश्वकर्मात्मजः son of Vishwakarma, बलि strong one, सः he, अस्य his, पिता father, यथा like, तथा so also, सागरे in the sea, सेतुम् bridge, बबन्ध built.
Nala the son of Vishwakarma, the foremost of the Vanaras and strong like his father built the bridge in the sea.