Nilgiri hills in Tamilnadu join Western ghats and eastern ghats as it is about the base of Deccan plateau and the eastern ghats End there duly combining with Western ghats till Kerala

Eastern Ghats and Western Ghats are two major mountain ranges in India that run parallel to the east and west coast respectively. The point at which these two ranges meet is known as the "Palghat Gap" or "Palakkad Gap". It is located in the Nilgiri Hills, making option C (Nilgiri Hills) the correct answer.

Explanation:

- The Eastern Ghats and Western Ghats are two distinct mountain ranges that extend along the eastern and western coasts of the Indian subcontinent.
- The Eastern Ghats start from the northern Odisha and run down through Andhra Pradesh and Tamil Nadu, ending at the southern tip of the Deccan Plateau.
- The Western Ghats stretch from Gujarat in the north to Tamil Nadu in the south, covering the states of Maharashtra, Goa, Karnataka, and Kerala.
- The point at which the Eastern Ghats and Western Ghats converge is known as the Palghat Gap or Palakkad Gap.
- The Palghat Gap is located in the Nilgiri Hills, a part of the Western Ghats. It is a low-lying pass that acts as a corridor connecting the state of Kerala with the rest of India.
- The Nilgiri Hills are situated in the southern part of the Western Ghats. It covers parts of Tamil Nadu, Kerala, and Karnataka.
- The highest peak in the Nilgiri Hills is Anamudi, which is also the highest peak in South India. However, Anamudi is not the point of convergence of the Eastern Ghats and Western Ghats.
- The Palani Hills, mentioned in option A, are located in Tamil Nadu but they do not mark the convergence point of the two mountain ranges.
- Similarly, the Shevaroy Hills, mentioned in option D, are also situated in Tamil Nadu but they do not join the Eastern Ghats and Western Ghats.
- Therefore, the correct answer is option C (Nilgiri Hills), as it is in the Nilgiri Hills that the Eastern Ghats join the Western Ghats at the Palghat Gap.