Valmiki Ramayana Bala Kanda Sarga 3 Shloka 34
Original Shlokaसङ्गमं च समुद्रेण नलसेतोश्च बन्धनम् । प्रतारं च समुद्रस्य रात्रौ लङ्कावरोधनम् ।।1.3.34।।
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समुद्रेण with the lord of the seas, सङ्गमम् meeting, नलसेतो: बन्धनं च construction of bridge by Nala, समुद्रस्य ocean's, प्रतारं च crossing, रात्रौ during night, लङ्कावरोधनम् seige of Lanka.
(He described) the meeting with the (lord of the) seas, the construction of bridge by Nala, the crossing of the ocean and the seige of Lanka during night.