Valmiki Ramayana Kishkindha Kanda Sarga 40 Shloka 64
Original Shlokaतस्य शैलस्य पृष्ठेषु निर्झरेषु गुहासु च।।4.40.64।। रावण स्सह वैदेह्या मार्गितव्यस्ततस्ततः।
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तस्य शैलस्य this mountain's, पृष्ठेषु on the plain land, निर्झरेषु by the mountain streams, गुहासु च and in caves, वैदेह्या सह along with Vaidehi, रावणः Ravana, ततस्ततः all over, मार्गितव्यः should be searched.
'You may look for Ravana and also for Vaidehi even behind the mountain on the plains and also near the mountain streams and caves all over.