The path from Mandapam through the ocean to the island known as Pambam consists partly of sand and partly of water. The island of Pambam is about seventeen miles long and six miles wide. On this island, four miles north of Pambam Harbour, is Setubandha, where the temple of Rāmeśvara is located. This is a temple of Lord Śiva, and the name Rāmeśvara indicates that he is a great personality whose worshipable Deity is Lord Rāma. Thus the Lord Śiva found in the temple of Rāmeśvara is a great devotee of Lord Rāmacandra. It is said, devī-pattanam ārabhya gaccheyuḥ setu-bandhanam: “After visiting the temple of the goddess Durgā, one should go to the temple of Rāmeśvara.”In this area there are twenty-four different holy places, one of which is Dhanus-tīrtha, located about twelve miles southeast of Rāmeśvara. It is near the last station of the Southern Railway, a station called Ramnad. It is said that here, on the request of Rāvaṇa’s younger brother Vibhīṣaṇa, Lord Rāmacandra destroyed the bridge to Laṅkā with His bow while returning to His capital. It is also said that one who visits Dhanus-tīrtha is liberated from the cycle of birth and death, and that one who bathes there gets all the fruitive results of performing the yajña known as Agniṣṭoma.
Ref>>Srila Prabhupada Vani.