Dhosi Hill is an extinct volcano that stands alone at the north-west end of the Aravalli mountain range in southern Haryana, India.

[citation needed] It is among the most ancient Vedic religious sites in Haryana located on the route of oldest flow of Sarasvati River.

This being a volcanic hill had erupted on the banks of the Drishadvati, which had its origin in Aravalli mountains, from Lord Brahma's abode at Pushkar Lake near Ajmer.

Lord Manu, Rishis like Bhrigu, Chyavana, Durvasa, Pippalada etc., who have contributed to various Sanskriti scriptures, had their Ashrams in the vicinity, 50 km radius of this hill.

[citation needed] These villages are situated on the three waterfalls that become active during the monsoons that occur in July–August, being created from the overflow of a reservoir at the summit.

During the Mahabharata period, the Nara Rashtra, on the Hastinapur to Chambal route, was conquered by the youngest Pandava brother Sahdev.

Later, a fort built at Dhosi Hill by the King Nun Karan of Luni (now called Nasibpur, on northern outskirt of Narnaul), was completely destroyed in an attack.

Subsequently, Yadavas King Rao Ganga Singh Nuniwal built another fort on that site, the remnants of which still survive on the Dhosi hill.

The fort was constructed to safeguard the heritage and ashrams on the hill from frequent attacks by Muslim invaders during the medieval period.

A plaque is put on the Dam to this effect which states that reservoir could be used for bathing by all shades of Hindu pilgrims, including Sanatani, Harijan, Arya Samaji, Buddhists, Jains and Sikhs.

[citation needed] In 2003, the reservoir was desilted by Indian National Trust for Art and Cultural Heritage, an NGO based in Delhi and Haryana.

[citation needed] Those visiting the hill on pilgrimage perform a parikrama (circumambulation) of it since the time of Mahabharata and Guru Shaunaka of Pandavas.