Thud Ridge was the nickname given by United States Air Force F-105 Thunderchief pilots (the aircraft being nicknamed "Thud") during the Vietnam War to the Tam Dao range a 24 km, 5000 ft high ridge that ran parallel to the Red River approximately 32 km northwest of Hanoi, which was both a waypoint during air attacks and a terrain masking feature for ingressing fighters in the vicinity of Hanoi, North Vietnam.
Location of Thud Ridge
|Range||Tam Dao range|
The North Vietnamese eventually installed anti-aircraft artillery on the ridge using heavy-lift helicopters.
The ridge features heavily in the book Thud Ridge.