In all these, difficult of access, as also in rivers and tanks, you should thoroughly search for Rāvana along with Vaidehī.
तेषु सर्वेषु दुर्गेषु सरस्सु च सरित्सु च। रावणः सह वैदेह्या मार्गितव्यस्ततस्ततः॥