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Palani Hills, range of hills, an eastward extension of the Western Ghats, in southwestern Tamil Nadu state, southern India. The range is a continuation of the Anaimalai Hills in Kerala state. The Palanis are about 45 miles (70 km) wide and 15 miles (23 km) long. In the south the hills terminate abruptly in steep slopes. The upper Palanis, in the west, consist of rolling hills covered with coarse grasses; dense forests grow in the...