Valmiki Ramayana Yuddha Kanda Sarga 22 Shloka 74
Original Shlokaदशयोजनविस्तीर्णंशतयोजनमायतम् । ददृशुर्देवगन्धर्वानलसेतुंसुदुष्करम् ।।6.22.74।।
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देवगन्धर्वाः gods and Gandharvas, दशयोजनविस्तीर्णम् ten yojanas in width, शतयोजनम् hundred yojanas, आयतम् in length, सुदुष्करम् exceedingly difficult to build, नलसेतुम् bridge built by Nala, ददृशुः witnessed.
Gods and Gandharvas witnessed the bridge built by Nala that was ten yojanas in width and hundred yojanas in length.