The correct answer is: Western.
The Nilgiri Hills are a mountain range in the Western Ghats of India. They are located in the states of Tamil Nadu, Kerala, and Karnataka. The Nilgiri Hills are a popular tourist destination, known for their scenic beauty and cool climate. The highest peak in the Nilgiri Hills is Doddabetta Peak, which is located in Tamil Nadu.
The Nilgiri Hills are a biodiversity hotspot, with a wide variety of plant and animal life. The region is home to several endangered species, including the Nilgiri tahr, the Nilgiri langur, and the Nilgiri marten.
The Nilgiri Hills are also an important watershed, providing water to millions of people in the region. The rivers that originate in the Nilgiri Hills flow into the Bay of Bengal and the Arabian Sea.
The Nilgiri Hills are a beautiful and important region of India. They are a popular tourist destination, a biodiversity hotspot, and an important watershed.
The other options are incorrect because:
- Option (a), Northern, is incorrect because the Nilgiri Hills are not located in the northern part of Tamil Nadu.
- Option (b), Eastern, is incorrect because the Nilgiri Hills are not located in the eastern part of Tamil Nadu.
- Option (c), Southern, is incorrect because the Nilgiri Hills are not located in the southern part of Tamil Nadu.