They are sandwiched between the Uppanar and Bay of Bengal
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/sea-erosion-poses-threat-villages
[2] http://admin.indiaenvironmentportal.org.in/category/author/av-ragunathan
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-chennai
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coastal-erosion
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cyclones
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/storms
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/soil-erosion
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/natural-disasters