Thirty-three geomorphologic features covering an area of 2765 km2 and spread over the length of 1117 km were identified and studied spatially and temporally to assess their past and present status. Moreover, the effect of tsunamis on these features was investigated and is discussed in detail. Analysis of the results shows that any one of the relief features present along a given coast is the result of a combination of processes, sediments, and the geology of the coast itself. Beaches, for example, were located only in the central-northern and southern parts of the study area, while the central part is devoid of beaches. Before the last tsunami in 2004, the measurable extent of beaches throughout the study area was increasing due to continuous sedimentation process occurring during 1992–2003. However, the tsunami of 2004 had a major impact on the Tamil Nadu beaches, resulting in their modification. Similarly, other features are treated in this paper.