1. The coastal islands along the western coast are mostly rocky islands and many of them are in the form of submerged wave-cut platforms. The islands along the eastern coast are mostly depositional islands formed by the deposition of sand or silt (deposit).
2. The islands in the Gulf of Kachchh are mostly in the form of fringing coral reefs. Along the Konkan and Malabar coasts, there are large numbers of depositional islands along the Bay of Bengal.
3. As compared to the tiny and rocky islands along the western coast, the depositional islands along the coast of West Bengal are larger.
4. The islands along the coast of West Bengal are subjected to changes in their coastlines and area due to the deposition of silt brought by the distributaries of the Ganga-Brahmaputra-Meghna drainage system.
5. There are very few such noticeable changes in the case of islands along the Western Coast.
