TheMach Loop (also known as theMachynlleth Loop,Welsh:Dolen Mach) is a series of valleys in theUnited Kingdom in west-centralWales, notable for their use aslow-level training areas for fast aircraft. The system of valleys lies 13 km (8 mi) east ofBarmouth between the towns ofDolgellau to the north andMachynlleth to the south, from the latter of which it takes its name. The training area is part of theUnited Kingdom Low Flying System and lies within Low Flying Area 7 (LFA7), which covers all of Wales.[1]
In December 2018, a recommendation was circulated within theMinistry of Defence (MoD) which resulted in a reduction in the number of aircraft using the Mach Loop. In addition to this, all non-UK based aircraft are also prohibited from using the Loop unless part of a UK exercise.[4]
The Mach Loop is particularly popular withplane spotters and photographers, as it is among the few places in the world where visitors can see combat aircraft flying below them.[5] One popular viewing point is the carpark located on the site ofLlyn y Tri Greyenyn.
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