"It was writer John Gillham who originally realised the mountains of Wales formed a sinuous spine running North/South from coast to coast through the country. In his book ‘Snowdonia to the Gower’ he described a walk along this route and this inspired long distance runner Ian Waddell to organise a stage race for charity" (https://www.dragonsbackrace.com/news/2012/1/11/historical-article-by-rob-howard)
This FKT outlines a coast to coast (North-South) route along the spine of Wales, synonymous with the Dragon depicted on its flag, the route was later named the Dragon's Back (Cefn Y Ddraig) joining two major castles and culminating in the capital, Cardiff.
https://montane.com/blogs/blog/the-story-behind-the-dragon-s-back-race
https://www.dragonsbackrace.com/dragons-back-fkt