Location of Thud Ridge
|Range||Tam Dao range|
Thud Ridge was the nickname given by United States Air Force F-105 "Thud" pilots during the Vietnam War to the Tam Dao range a 24km, 5000ft high ridge that ran parallel to the Red River approximately 32km 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.
The North Vietnamese eventually installed anti-aircraft artillery on the ridge using heavylift helicopters.
The ridge features heavily in Thud Ridge (book).