The coral reefs of Rameshwaram are an important part of the sacred geography. They also have a great evolutionary history. They provide a prominent support for the Gulf of Mannar biodiversity. However today they are facing many threats mainly due to the pollution and global warming. We provide a glimpse into some interesting aspects of the Rameshwaram coral reefs. The coral reefs have been there for millions of years. Home to many organisms the marine biodiversity is heavily dependent on the coral reefs and they had also protected the population from the 2004 Tsunami.