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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.[1][2]

Thud Ridge
Thud Ridge.jpg
Location of Thud Ridge
RangeTam Dao range
Coordinates21°30′22.2″N 105°36′31.02″E / 21.506167°N 105.6086167°E / 21.506167; 105.6086167Coordinates: 21°30′22.2″N 105°36′31.02″E / 21.506167°N 105.6086167°E / 21.506167; 105.6086167

The North Vietnamese eventually installed anti-aircraft artillery on the ridge using heavy-lift helicopters.[3]

Phúc Yên Air Base is located at the base of the ridge, while Kép Air Base is located east of the ridge.

The ridge features heavily in the book Thud Ridge.


  1. ^ Broughton, Jack (1969). Thud Ridge. J. B. Lippincott Company. ISBN 978-0-85979-116-8.
  2. ^ Kelley, Michael (2002). Where we were in Vietnam. Hellgate Press. pp. 5–508. ISBN 978-1555716257.
  3. ^ "Thuds, the Ridge, and 100 Missions North". Air & Space Magazine. February 2009. Retrieved 4 January 2015.

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