According to Wildlife Trust of India (WTI), the Brahmagiri-Nilgiris-Eastern Ghats population has about 6,300-6,500 elephants, distributed over 12,000 sq km of habitat.  

• A number of the Protected Areas, including Bandipur, Nagarahole, Mudumalai, Wayanad, Biligirirangan Swamy Temple, Kaveri and Brahmagiri, fall within the area.  

• The diversity in vegetation, ranging from dry thorn forest to the montane shola grasslands, makes this one of the best elephant reserves in the country with a demographically and genetically viable population.  
• This is the largest population of elephants in the country, and possibly in Asia as well. 
• The Sigur plateau (Tamil Nadu) connects the Western and Eastern Ghats.  
• The WTI’s book, Right of Passage-Elephant Corridors of India published first in 2006 lists four corridors in the Sigur plateau. 

Source: https://www.thehindu.com/news/national/tamil-nadu/protecting-pachyderm-pathways/article32885452.ece