Ramanathapuram District contains the Indian portion of Rama's Bridge, an east-west chain of low islands and shallow reefs that extend between India and the island nation of Sri Lanka and separate the Palk Strait from the Gulf of Mannar. The Palk Strait is presently navigable only by shallow-draft vessels.
Ramanathapuram District was formed by clubbing portions from Madurai and Tirunelveli district. During the British period this district was called "Ramnad". The name continued after independence. Later the district was renamed as Ramanathapuram to be in conformity with the Tamil Name for this region.
Web : http://www.ramnad.tn.nic.in/