<Tr> <Th_colspan="2"> Climbing </Th> </Tr> <Tr> <Th> Easiest route </Th> <Td> NH 67 (Satellite view) or Nilgiri Mountain Railway </Td> </Tr> <P> The Nilgiri Mountains (Sanskrit: नीलगिरि; Tamil: நீலகிரி; Malayalam: നീലഗിരി; Kannada: ನೀಲಗಿರಿ; Neelagiri, literally blue hills) form part of the Western Ghats in western Tamil Nadu of Southern India . At least 24 of the Nilgiri mountains' peaks are above 2,000 metres (6,600 ft), the highest peak being Doddabetta, at 2,637 metres (8,652 ft). </P> <P> Nilgiri literally means blue hill in Sanskrit and all four major Dravidian languages . The usage of the name Nilgiri has been observed since at least 1117 CE . It is thought that the bluish flowers of kurinji shrubs gave rise to the name . </P>

What is the name of the highest summit of nilgiri hills