The fort of Raja Nahar Singh is located in which place of Haryana?

The correct answer is: Ballabhgarh.

Raja Nahar Singh was a 18th-century Jat ruler of Ballabhgarh, a town in Haryana, India. He was a brave and powerful ruler who fought against the Mughals and the British. The fort of Raja Nahar Singh is located in Ballabhgarh. It is a historical monument that is worth visiting.

The other options are incorrect. Mahendragarh is a town in Haryana, but it is not the location of the fort of Raja Nahar Singh. Rohtak is a city in Haryana, but it is not the location of the fort of Raja Nahar Singh. Yamunanagar is a city in Haryana, but it is not the location of the fort of Raja Nahar Singh.