When the nights get longer and the air gets colder, the dragons wake and send their steam winding down our river valleys. This 'Dragon's Breath' (or Cloud Inversion for those less poetically minded) is an incredible sight, as the valley floor becomes carpeted with cloud.
(Dragon's Breath in the Wye Valley, by @judith_angharad on twitter)
Sights like this are a real benefit of visiting Monmouthshire in the autumn & winter, as longer nights allow more time for the air to cool close to the ground and create these spectacular effects.
The hills of Abergavenny are a great place to see this phenomenon, as you can climb above the mist and look out over a sea of cloud, with island-like mountain tops wearing the gold, amber and red of autumn.
(Clouds wrapped around the Black Mountains near Abergavenny, by @kole_videography)
Dragon's Breath is most common on our valley floors (both Usk and Wye), with the Wye Valley viewpoints, including Eagle's Nest, a particularly great place to see it.
(Dragon's Breath in the Wye Valley, looking south-west into Wales & Chepstow by @roamingwithbrad)