Nandi Hills or Nandi betta (Anglicised forms include Nandidrug and Nandydroog) is an ancient hill fortress in southern India, in the Chikkaballapur district of Karnataka state. It is 10 km from Chickballapur town and approximately 60 km from the city of Bengaluru. The hills are nestled near the town of Nandi. In traditional belief, the hills are the origin of the Arkavathy River. There are many stories about the origin of the name Nandi Hills. During the Chole period, Nandi Hills was called Ananda Giri meaning The Hill of Happiness. Another story is that Yoga Nandeeshwara performed penance here, and so it was named after him. Nandi is also commonly called Nandidurga (Fort) because of the fort built here by the ruler Tippu Sultan. It is also perhaps called Nandi Hills because the hills resemble a sleeping bull (Nandi).
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