The correct answer is Mukandara hills.

• Mukandara hill is an extension of Vindhya ranges in Rajasthan.

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• Mukandara hills
  • ​Mukundara Hills are located in the Hadoti region of Rajasthan.
  • This is surrounded by four rivers Ramzan, Ahu, Kali and Chambal and is situated between the two parallel mountains Mukundara and Gagrola.
  • It comes under the drainage area of ​​tributaries of Chambal river.
• ​Mukundra Tiger Reserve
  • ​​Mukundra Tiger Reserve, popularly known as Darrah Wildlife Sanctuary, is spread across 4 districts – Bundi, Kota, Jhalawar & Chittorgarh.
  • It is located just 50 kilometres from Kota.
  • It is the 3rd tiger reserve in Rajasthan, after Ranthambore & Sariska Tiger Reserves.

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• ​The Vindhya Range 
  • Vindhyachal is a complex, discontinuous chain of mountain ridges, hill ranges, highlands and plateau.
  • Technically, the Vindhyas do not form a single mountain range in the geological sense.
  • The exact extent of the Vindhyas is loosely defined, and the term covered a number of distinct hill systems in central India.
  • The Vindhya Range runs north of and roughly parallel to the Narmada River in Madhya Pradesh, and its hilly extensions.
  • The range extends up to Gujarat in the west, Uttar Pradesh and Bihar in the north and Chhattisgarh in the east. 
  •  A series of hills connects the Vindhya extension to the Aravalli Range near Champaner.