Mach Loop

The Mach Loop is a renowned series of valleys located in west-central Wales, primarily within the Snowdonia National Park, between the towns of Dolgellau to the north and Machynlleth to the south. Its name derives from the latter town, which lies near its southern edge.   

This area is famous worldwide among aviation enthusiasts and photographers because it forms a crucial part of the UK's Low Flying System (specifically designated LFA7 - Low Flying Area 7). It is regularly used by the Royal Air Force (RAF) and allied air forces, including the USAF, for essential low-level flight training.   

Pilots practice navigating the challenging, mountainous terrain at high speeds and very low altitudes – sometimes down to just 250 feet (76 metres) above the ground. The unique topography of the valleys allows spectators positioned on the hillsides to often witness fast jets, transport aircraft, and helicopters maneuvering below them or at eye level. This provides exceptionally close and dramatic views, making the Mach Loop a premier, albeit unofficial, location for military aircraft spotting and photography.