It is located 35 Kilometres north from the district headquarters Ramanathapuram.

R. S. Mangalam is 11 kilometres from the Bay of Bengal and features a humid climate.

R. S. Mangalam is surrounded by Ramanathapuram, Devipattinam, Thondi, Thiruvadanai, Nambuthalai, Thirupalaikudi, ilayangudi and Paramakudi.

As of 2011 Indian Census, R. S. Mangalam had a total population of 14,565, of which 7,296 were males and 7,269 were females.

This article related to a location in Ramanathapuram district, Tamil Nadu, India is a stub.