Valmiki Ramayana Yuddha Kanda Sarga 3 Shloka 21
Original Shlokaस्थितापारेसमुद्रस्यदूरपारस्यराघव । नौपथोपिश्चनास्त्यत्रनिरादेशश्चसर्वशः ।।6.3.21।।
1 source checked for this shloka
राघव: O Raghava, दूरपारस्य: difficult to cross, समुद्रस्य: ocean's, पारे: other shore, स्थिता: located, अत्र: there, नौपथोपिश्च: passage for ships, नास्ति: not possible, सर्वशः all over, निरादेशश्च: nothing around.
"O Raghava Lanka is located on the other shore of the ocean. Passage through the sea is not possible. It is away from all and there is nothing around."