Lanka

A strong fort like Lanka and the moat of sea around it-— such an abode of Ravana is no more traceable. (Asa Kabir, p. 481)

The Fort of Lanka was made of gold; What did foolish Ravana take away with him ? (Bhairo Kabir, p. 1158)

The island of Lanka as described in the Ramayana was very vast and a place of great magnificence. It had seven wide moats and seven walls of stone and metal. It was made of gold by Vishwakarma (the Vedic Architect of the Devtas). According to the Bhagavata Purana, this island was formerly the summit of Mount Meru, which was broken off by the wind-god and thrown into the sea.

References

1. Kohli,Surindar Singh ed,Dictionary of Mythological References in Guru Granth Sahib 1993