Nilgiri is a term typically used to refer to the blue mountains in Tamil Nadu, India. However, there are several synonyms that can be used instead of Nilgiri, including the Nilgiri Hills, the Blue Mountains, the Nilgiris, and the Neelagiri Mountains. The word Nilgiri translates to "blue mountains" in Tamil and is a popular tourist destination due to its scenic beauty and unique flora and fauna. In addition to the above synonyms, the term may also be referred to as the Nilgiri Biosphere Reserve, as it is a UNESCO World Heritage Site and home to several endangered species of plants and animals.