Patnitop or Patni Top is a hilltop tourist location in Udhampur district in Jammu and Kashmir state of India on National Highway 1A 112 km (70 mi) from Jammu on the way from Udhampur to Srinagar. Situated on a plateau in the Shiwalik 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. India's longest road tunnel, the 9.2 km (6 mi) long Chenani-Nashri Tunnel or Patnitop Tunnel is being constructed starting from about 2 km (1 mi) from Chenani town south of Patnitop to Nashri village north of Patnitop to reduce the distance from Jammu to Srinagar and reduce traffic jams on NH-1A that occur due to snowfall and avalanche in winter at Patnitop.