Patnitop or Patni Top is a hilltop tourist location situated in the Udhampur district of Jammu and Kashmir, India. It is in located on the Jammu-Srinagar National Highway (which is part of National Highway 44, formerly 1A), 112 km (70 mi) from Jammu, on the way from Udhampur to Srinagar. Situated on a plateau in the Shivalik belt of the Himalayas, Patnitop sits at an altitude of 2,024 m (6,640 ft). The river Chenab flows in close proximity to this location. Patnitop lies in District Udhampur of Jammu And Kashmir
Snowfall and avalanche in winter at Patnitop used to obstruct the Jammu-Srinagar National Highway a few times every winter and causes long queues of vehicles, sometimes for days. These problems were mitigated by the opening of the Dr. Syama Prasad Mookerjee Tunnel. At 9.2 km (6 mi), it is India's longest road tunnel. It starts from about 2 km (1 mi) from Chenani town south of Patnitop to Nashri village north of Patnitop, reducing the distance from Jammu to Srinagar by 31 km (19 mi) and bypassing Patnitop.